Rhodiola rosea
A Phytomedicinal Overview
by
Top photos: ©2002
Zakir Ram azonov;
Bottom photo:©2002
Patricia Gerbarg
Richard P. Brown, M.D.,
Patricia L. Gerbarg, M.D.,
and Zakir Ramazanov, Ph.D., D.S.
hodiola rosea , also known as “golden
root” or “roseroot” belongs to the plant
family Crassulaceae.1 R. rosea grows primarily in dry sandy ground at high altitudes in the arctic areas of Europe and
Asia.2 T he plant reaches a height of 12
to 30 inches (70cm) and produces yellow blossoms. It is a perennial with a
thick rhizome, fragrant when cut. T he
Greek physician, Dioscorides, first
recorded medicinal applications of rodia riza in 77 C.E. in De Materia Medica.3 Linnaeus renamed it Rhodiola rosea referring to the rose-like attar (fragrance) of the fresh
cut rootstock.4
For centuries, R. rosea has been used in the traditional medicine of Russia, Scandinavia, and other countries. Between 1748 and 1961 various medicinal applications of
R. rosea appeared in the scientific literature of Sweden, Norway, France, Germany, the
Soviet Union, and Iceland.2,4-12 Since 1961, more than 180 pharmacological, phytochemical and clinical studies have been published. Although R. rosea has been extensively studied as an adaptogen with various health-promoting effects, its properties
remain largely unknown in the West. In part this may be due to the fact that the bulk
of research has been published in Slavic and Scandinavian languages. T his review pro-
R
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vides an introduction to some of the traditional uses of R. rosea, its
phytochemistry, scientific studies exploring its diverse physiological effects, and its current and future medical applications.
Rhodiola rosea in Traditional Medicine
Traditional folk medicine used R. rosea to increase physical
endurance, work productivity, longevity, resistance to high altitude
sickness, and to treat fatigue, depression, anemia, impotence, gastrointestinal ailments, infections, and nervous system disorders. In
mountain villages of the Republic of Georgia, a bouquet of roots
is still given to couples prior to marriage to enhance fertility and
assure the birth of healthy children.2 In Middle Asia, R. rosea tea
was the most effective treatment for cold and flu during severe
Asian winters. Mongolian doctors prescribed it for tuberculosis
and cancer.13 For centuries, only family members knew where to
harvest the wild “golden roots” and the methods of extraction.2
Siberians secretly transported the herb down ancient trails to the
Caucasian Mountains where it was traded for Georgian wines,
fruits, garlic, and honey. Chinese emperors sent expeditions to
Siberia to bring back the “golden root” for medicinal preparations.
Linnaeus wrote of R. rosea as an astringent and for the treatment
of hernia, leucorrhoea (vaginal discharge), hysteria, and
headache.4,7 In 1755 R. rosea was included in the first Swedish
Pharmacopoeia. Vikings used the herb to enhance their physical strength and endurance.14 German researchers described
the benefits of R. rosea for pain, headache, scurvy, hemorrhoids, as a stimulant, and as an anti-inflammatory.15,16
In 1961, G.V. Krylov, a Russian botanist and taxonomist in
the Department of Botany at the Novosibirsk Branch of the Russian Academy of Sciences, led an expedition to the cedar taiga in
the Altai Mountains of southern Siberia where he located and
identified the “golden root” as Rhodiola rosea.17 Extracts of the
R. rosea root were found to contain powerful adaptogens.
Research revealed that it protected animals and humans from
mental and physical stress, toxins, and cold.2,17 T he quest for new
medicines to treat diseases such as cancer and radiation sickness,
and to enhance physical and mental performance, led to the discovery of a group of phenylpropanoids that are specific to R.
rosea . (See Phytochemistry section below.)
Geographical Distribution and
Taxonomy of Rhodiola rosea
While Rhodiola as a genus may have originated in the mountainous regions of Southwest China and the Himalayas,18 botanists
have established that various species of the genus Rhodiola naturally display a circumpolar distribution in mountainous regions in
the higher latitudes and elevations of the Northern
Hemisphere. In Central
and Northern Asia, the
genus is distributed
from the Altai Mountains across Mongolia
into many parts of
Siberia.19 According to
Hegi, its distribution
in Europe extends from
Iceland and the British
Isles
across
Scandinavia as Rhodiola rosea Baxter,William . British phaenogam ous
far south as the botany. Oxford, published by the author, sold by J. H.
Parker [etc.], 1834-1843, vol. 5, plate 391. Coutesy of The
Pyrenees, the Hunt Institute for Botanical Docum entation.
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Alps, the Carpathian Mountains and other mountainous Balkan
regions. Several varieties of Rhodiola species have also been identified across Alaska, Canada, and the northern mountains of the
continental United States.20 In fact, the world database of botanical literature shows many citations identifying a broad range of
species of the genus Rhodiola , in some cases including R. rosea , in
many diverse locations in northern latitudes (see Table 1).
T he current taxonomical status of the genus Rhodiola has
become quite complex. Before
World War II, some taxonomists separated different
species of Rhodiola into
an independent genus,
belonging to the subfamily
Sedoidae. 20
T hen Rhodiola was
reclassified as a subgenus of the larger genus
Sedum , which contained
about 10 species. In 1963 Hegi
identified more than 50 species of
Rhodiola and re-established them as a
separate genus.20 Due to their morphological
similarities, they form a distinct Rhodiola
group.21 T here are still differing opinions among
specialists about which new species should or
should not be included in the genus Rhodiola . T he
rationale and defining criteria for the boundaries of
the genus remain somewhat controversial. T his is
not, in itself, necessarily counterproductive, since
the acquisition of botanical knowledge inevitably
stimulates new understanding and insight, creating the need for revised systems of classification.
In the case of R. rosea , however, this taxonomic
ambiguity may have unexpected and potentially
negative consequences.
Popularizing a phytomedicinal plant like R.
rosea can create confusion when the public is
offered a variety of “Rhodiola ” products
using the general plant family name instead
of the full botanical name of the particular
species. For example, products called “Rhodiola
spp., Tibetan Rhodiola or Indian Rhodiola ” may
incorrectly imply equivalence with R. rosea
extract. Because of significant species-dependent
variation in phytochemistry and pharmacology,
the use of “Rhodiola ” as a general term is inaccurate
and misleading. T he correct identification of all Rhodiola
species according to precise and generally accepted botanical, phytochemical, and genetic taxonomic criteria is not
merely an abstract intellectual exercise. It is critical for both
scientific and phytopharmacological accuracy, as well as for
product labeling for the public. Consumers may need professional guidance to avoid purchasing ineffective brands, particularly those that do not provide full information, including the
complete botanical name of the plant species. Companies may
change their suppliers over time. T herefore, consumers should
periodically check independent sources of product evaluation, as
well as requesting information about quality control and content
from manufacturers.
T he pharmacological
and medicinal properties
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R ho di o l a r o s e a
of Rhodiola are speciesdependent phenomeA Phytomedicinal Overview
na.22 Of all the Rhodiola
species, R. rosea has been
the predominant subject of phytochemical, animal, and human
studies.2,18,23,24 Table 2 compares the research record of R. rosea with
all other species of the genus Rhodiola . Approximately 51 percent
of all animal studies and 94 percent of all human studies conducted on plants in the genus Rhodiola are on the species R. rosea . Only
R. rosea has passed extensive toxicological studies and has been certified safe for both animals and humans.25
Table 1. Distribution of plants in the genus Rhodiola
Asia: China (Gansu, Hebei, Jilin, Shanxi, Sichuan, Xinjiang); Kazakhstan and Uzbekistan; Mongolia; Russian Federation (Altai, Eastern
Siberia, Kam chatka, Khabarovsk, Magadan)
Europe: Austria; Bulgaria; Czechoslovakia; Finland; France; Greenland; Iceland; Ireland; Italy; Norw ay; Poland; Rom ania; Russian Federation (European part); Spain; Sw eden; United Kingdom ;Yugoslavia
North America: Canada (British Colum bia, Northw est Territory,
Yukon Territory); United States (Alaska, California, Colorado, Idaho,
Minnesota, Montana, Nevada, New Mexico, New York, Oregon,Tennessee, Utah,Virginia,Washington,Wyom ing)
Phytochemistry of Rhodiola rosea
T he investigation of the phytochemistry of R. rosea root has
revealed the presence of six distinct groups of chemical compounds:
• Phenylpropanoids: rosavin, rosin, rosarin (specific to R. rosea );
• Phenylethanol derivatives: salidroside (rhodioloside), tyrosol;
• Flavanoids: rodiolin, rodionin, rodiosin, acetylrodalgin, tricin;
• Monoterpernes: rosiridol, rosaridin;
• Triterpenes: daucosterol, beta-sitosterol;
• Phenolic acids: chlorogenic and hydroxycinnamic, gallic acids.
T he standardization of R. rosea root extracts has gone through
two distinct phases. Initially, in the 1970s, the compound responsible for its unique pharmacological properties was believed to be
salidroside (rhodioloside).2,23,24,26,27 T herefore, the first generation of
R. rosea tincture/extracts approved by the Russian Pharmacopoeia
Committee was standardized to a minimum of 0.8 percent salidroside content.25
In late 1980s, demand for R. rosea -based phytomedicines dramatically increased. T he wild-crafted raw material was over-harvested, resulting in a steady decline in the quality and effectiveness
of “Rhodiola ” preparations. Scientific investigation revealed that
other species of genus Rhodiola (which also contained salidroside)
were being substituted for R. rosea . While some of these mixed
batches were highly variable in quality, others had no pharmacological effect. Logically, the suspicion arose that the salidroside
standard was inadequate. Based on comparative analysis, the obvious hypothesis was that the original high potency product contained other active compounds specific to R. rosea that had not yet
been identified.
Using newly developed methods of analysis, Dubichev and colleagues demonstrated that R. rosea root contains three cinnamyl
alcohol-vicianosides — rosavin, rosin and rosarin — that are specific to this species.28,29 T he term rosavins can be used to include
rosavin, rosin, and rosarin (see chemical figures).
It became evident that salidroside is present in all chemically
analyzed plants in the genus Rhodiola , and in a wide variety of
species outside the genus.2,25-34 T he term salidroside is derived from
Salix, the genus name for the willows. Salidroside was first isolated
in 1926 from Salix triandra L. (Salicaceae).33 Since then it has been
detected in Vaccinium vitis-idaea L. (Ericaceae) and in Rhododendron35,36 (plants not belonging to the genus Rhodiola ) in concentrations that can be higher than levels found in Rhodiola species,
including R. rosea . T herefore, salidroside alone is not a useful
marker compound for differentiating true R. rosea from other Rhodiola species; nor should it be used as the only marker compound
for the standardization of R. rosea root extracts.
According to the revised 1989 Soviet Pharmacopeia,37 the
extracts of R. rosea — primarily in the form of water/alcohol tinctures or dried root extract — are now standardized for both
rosavins and salidroside. Although rosavins are now the accepted
marker for genetically pure R. rosea (and its extracts), they are not
necessarily the only pharmacologically active ingredients responsible for the efficacy observed in clinical studies. In fact, precise
identification of the compounds responsible for the numerous
health benefits of R. rosea remains to be confirmed.
R. rosea extracts used in most human clinical studies were standardized to minimum 3 percent rosavins and 0.8–1 percent
salidroside because the naturally occurring ratio of these compounds in R. rosea root is approximately 3:1.
Table 2. Comparison of human and animal studies of
plants in the genus Rhodiola *
Species nam e
Specific compounds set Rhodiola rosea
apart from other Rhodiola species
After more than a decade of research, Kurkin and colleagues presented evidence in 1986 that the chemical composition of R. rosea
root is, in fact, different from the other species of genus Rhodiola .23
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Anim al Studies
Hum an Studies
R.rosea
32
17
R.alterna
0
0
R.brevipetiolata
0
0
R.coccinea
1
0
R.crenulata
4
1
R.ellipticum
0
0
R.fastigita
2
0
R.gelida
0
0
R.henryi
0
0
R.heterodonta
1
0
R.kirilow ii
6
0
R.pinnatifida
1
0
R.quadrifidia
1
0
R.sachalinensis
6
0
R.sacra
5
0
R.w olongensis
1
0
R.yunnanensis
0
0
*NOTE: Num bers in this Table indicate the num ber of anim al and hum an
studies on each plant species of the genus Rhodiola , according to a Copernic
on-line database search, 2001.This article review s m any additional studies
not listed in online databases.
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Rhodiola rosea in Modern Medicine
Pharmacological and Clinical Studies
Since 1969, R. rosea has been included in official Russian medicine. T he Pharmacological and Pharmacopoeia Committee of the
Soviet Ministry of Health recommended medicinal use and industrial production of liquid R. rosea extract. In 1975, the Soviet Ministry of Health approved and registered preparation No. 75/933/14
as a medicine and tonic, allowing large-scale production under the
name Rhodiola Extract Liquid, an alcohol-based extract (40 percent ethyl alcohol). Medical and pharmacological texts describe its
use as a stimulant for asthenia (fatigue), for somatic and infectious
illnesses, in psychiatric and neurological conditions, and in healthy
individuals to relieve fatigue and to increase attention span, memory, and work productivity. T he common dose is 5–10 drops 2–3
times a day, 15–30 minutes before eating for a period of 10–20
days. In psychiatric disorders with fatigue, a starting dose of 10
drops 2–3 times a day is gradually increased up to 30–40 drops for
1–2 months.
In Sweden R. rosea was recognized as an Herbal Medicinal Product in 1985 and has been described as an antifatigue agent in the
Textbook of Phytomedicine for Pharmacists.9 In the textbook of pharmacology for dispenser training in Sweden, R. rosea is mentioned
as a plant with a stimulant action. Also the Pharmaceutical Book
(Läkemedelsboken 97/98) mentions R. rosea as one of the most
commonly used psychostimulants in the group of officially registered herbal medicinal products.11 In Denmark, R. rosea is registered as a medical product in the category of botanical drugs. Registered preparations are extensively used in Sweden and other Scandinavian countries to increase mental work capacity during stress,
as a psychostimulant, and as a general strengthener.
T he traditional use of R. rosea as a tonic in Siberian and Russian
medicine stimulated extensive research leading to identification of
R. rosea as an adaptogen, a substance that nonspecifically increases the resistance of an organism and does not disturb normal biological parameters. Studies in cell cultures, animals, and humans
have revealed antifatigue, anti-stress, antihypoxic (protection
against damaging effects of oxygen deprivation), anticancer,
antioxidant, immune enhancing and sexual stimulating
effects.2,18,24,38-40 Since the Russian and Bulgarian literature is so
extensive, this discussion will highlight seminal studies and major
reviews. T he authors were fortunate to gain access to original
reviews, articles, and doctoral theses. T his overview relies heavily
on monographs and peer-reviewed publications. T he research data
contained in these documents is helpful in understanding recent
human studies in normal and pathological conditions.
Effects upon the Central Nervous System
T he systematic study of pharmacological effects of R. rosea ,
begun in 1965, found that small and medium doses had a simulating effect, such as lengthening the time mice swim and remain
on vertical perches to the limit of their abilities. In contrast, larger
doses were found to have more sedative effects. Small doses
increased the bioelectrical activity of the brain, presumably by
direct effects on the brainstem ascending and descending reticular
formation.23-26,38,39,41 Further studies showed that medium range
doses, unlike tranquilizers, enhanced the development of conditioned avoidance reflexes in rats and facilitated learning based on
emotionally positive reinforcement.18,42-46 Overall, in small and
medium doses, R. rosea stimulated norepinephrine (NE), dopamine (D A),
serotonin (5-HT ), and nicotinic cholinergic effects in the central nervous system (CNS). It also enhanced the effects
of these neurotransmitters on the brain
by increasing the permeability of the
blood brain barrier to precursors of DA
and 5-HT.2,23,42,46-48,49
In comparing studies of R. rosea , Asian
ginseng (Panax ginseng C.A. Mey., Araliaceae), meclofenoxate (centrophenoxine), piracetam, citicholine, and other
nootropics (substances that enhance cognition, protect the brain, and have low
toxicity and few side effects), Petkov and
colleagues noted that all of these agents
enhance learning and memory in animal
models and increase 5-HT levels in the
frontal cerebral cortex.46-50 Diagram 1
illustrates the possible effects of R. rosea
on neurotransmitters in multiple neuronal pathways.51 Starting in the brain
stem, R. rosea promotes release of NE, 5HT, and DA in ascending pathways that
activate the cerebral cortex and the limbic system.2,49,50 Consequently, the cognitive (thinking, analyzing, evaluating, calculating, and planning) functions of the
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R ho di o l a r o s e a
cerebral cortex and the
attention, memory, and
A Phytomedicinal Overview
learning functions of the
prefrontal and frontal
cortex are enhanced. Other neuronal systems also contribute to the
many aspects of memory: encoding, sorting, storage, and retrieval.
For example, the cholinergic system uses the neurotransmitter
acetylcholine (Ach) and contributes to memory function via pathways ascending from the memory storage systems of the limbic system to various areas of the cerebral cortex (memory retrieval).
Agents that block Ach suppress the activity of these ascending
pathways and interfere with memory. R. rosea reverses this blockade.49,50 T he deterioration of these systems with age results in ageassociated memory loss.52 R. rosea may prevent or ameliorate some
age related dysfunction in these neuronal systems.
As an antioxidant,53-55 R. rosea may help protect the nervous system from oxidative damage by free radicals. Stress interferes with
memory functions and, over time, causes deterioration in memory
systems. In addition to enhancing cognitive functions, learning,
and memory by stimulating NE, DA, 5-HT, and Ach neuronal
systems, R. rosea may exert positive effects on memory and cognition by improving resistance to physical and emotional stress.
T hus, the dual action of cognitive stimulation and emotional
calming creates benefits for both immediate cognitive and memory performance and for the long-term preservation of brain functions.
T he psychostimulant effects of R. rosea were studied in 53
healthy subjects and 412 patients with neuroses and asthenic syndromes (of both functional and organic origin).56-58 Symptoms of
asthenia (fatigue, decline in work capacity,
trouble falling asleep, poor appetite,
irritability, and headaches) responded
favorably to R. rosea 50 mg three
times a day. Treatment durations ranged from 10 days to 4
months. T he asthenic states
included both psychiatric and
physical causes, for example, following influenza or other illness. In an
open study of 128 patients aged 17–55
years, R. rosea alleviated fatigue, irritability, distractibility, headache, weakness and other vegetative symptoms in 64 percent of cases.57 Improvement
was assessed by psychological testing and work
productivity.
In 1869 Beard coined the term “neurasthenia”
to include various forms of nervous asthenia. Controversy over this term has centered on the overlap of symptomatology and co-morbidity with other conditions (e.g., depression, neuroses, somatoform disorders, and chronic fatigue syndrome). Although this diagnosis has fallen out of favor in the United States and no longer appears in The Diagnostic and Statistical
Manual of the American Psychiatric Association (DSM-IV),59 it is
still widely used throughout the world.60-63 Neurasthenia is defined
by the World Health Organization in the International Classification of Diseases (ICD-10)64 as:
• either, persistent and distressing feelings of exhaustion after
minor mental effort, or persistent and distressing feelings of fatigue
after minor physical effort;
• accompanied by one or more of the following symptoms: muscular aches or pains; dizziness; tension headaches; sleep distur-
44 | HerbalGram 56
bance; inability to relax; and irritability;
• inability to recover through rest, relaxation or enjoyment;
• does not occur in the presence of organic mental disorders, affective disorders or panic or generalized anxiety disorder.
In an open study 27 healthy students, physicians, and scientists
aged 19–46 years were given 10 drops of R. rosea tincture (equivalent to 100–150 mg R. rosea extract) once or twice a day for 2–3
weeks, beginning several days before intense intellectual work,
such as final exams.58 T he extract improved the amount and quality of work and in all cases prevented asthenic decompensation
(loss of work capacity due to fatigue). A series of studies using a
proofreading test showed that a one-time dose of R. rosea did not
significantly increase the number of symbols corrected, but very
significantly decreased the percent of errors made, particularly over
an 8-hour period.65,66 Positive results found in the studies of proofreading tests were based on 300 mg/day or more. In medical treatments the usual doses are 200–600 mg/day. R. rosea increased
intellectual capacity (particularly by improving perception and
processing of information) to a greater degree than an extract of
eleuthero, also called Siberian ginseng (Eleutherococcus senticosus
Rupr. et Max., Araliaceae).18
T he decrease in physical and mental performance of physicians
on prolonged night call is well known. Low dose (170 mg/day) R.
rosea extract was given to 56 young healthy physicians on night
call.18 T he effect was measured as total mental performance calculated as “Fatigue Index.” T he tests reflected an overall level of mental fatigue involving complex cognitive functions, such as associative thinking, short-term memory, calculation, concentration, and
speed of audio-visual perception. T hese parameters were tested
before and after night duty during three periods of two weeks each
in a double-blind crossover trial. A statistically significant improvement in mental performance tests was observed in the treatment group (R. rosea ) during the first two-week period. However, at 6 weeks the effect appeared to be lost.
No side effects were reported. T hese results suggest that
R. rosea extract can reduce fatigue under certain stressful
conditions for some period of time. Possible reasons for
the loss of efficacy over time may be the low dose used,
the crossover design, or the overall length
of night duty with increased fatigue by
weeks 5 and 6.
Spasov and colleagues compared 100
mg/day R. rosea extract (SHR-5, Swedish
Herbal Institute, Goteborg, Sweden; standardized to 3 percent rosavin and 0.8 percent salidroside) with placebo in a double-blind 20-day study
of 60 Indian medical students studying in Russia
during their final exam period.38 Despite the low
dosage, investigators found significant improvements in general well being, physical fitness, mental fatigue, final
exam grades, and coordination, but not in some aspects of cognitive functioning in students taking R. rosea extract compared to
placebo.
In a double-blind placebo-controlled study of 60 foreign students at a Russian high school, administration of a R. rosea extract
(660 mg/day of a preparation named Rodaxon) resulted in an
increase in physical (velergometric) work capacity, coordination,
kinesthetic sensitivity, and general well being along with a decrease
in psychic fatigue and situational anxiety.39 Unfortunately, this
study provides no information on the amount of R. rosea in the
Rodaxon preparation, which is commercialy unavailable.
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R. rosea was beneficial in posttraumatic and vascular lesions of
the brain. It was especially effective in combination with piracetam
for patients with marked cognitive dysfunction.56 However, it did
not reduce manic symptoms and could worsen paranoid states. In
one study of more clearly depressed patients, R. rosea in combination with tricyclic antidepressants (TCAs) produced significant
improvement in the majority of cases and decreased side effects of
the TCAs.67 Ultimately, some of these patients were able to respond
to R. rosea alone.
Antipsychotic medications used in large doses over many years
to treat schizophrenic patients sometimes affect the
dopaminergic nerves in the basal ganglia, the same
nerves that are damaged in patients with Parkinson’s
Disease. When these nerves are compromised,
patients develop a constellation of “Parkinsonian”
symptoms, including stiffness, tremors, bradykinesia (slowed movements), and others. Anticholinergic medications have been used to relieve these symptoms when they are caused by antipsychotic medication; however, they sometimes fail to help. In schizophrenic patients whose anticholinergic medications had failed to relieve Parkinsonian symptoms,
R. rosea was found to be of benefit.56,68
R. rosea may affect emotional tone by influencing
neurotransmitter monoamine levels (NE, DA, 5HT ) in nerve tracts involved in the regulation of
mood, anxiety, and emotion in the amygdala, hippocampus, hypothalamus, and midbrain. T he stimulation of nicotinic cholinergic activity in the emotional circuits of the limbic system (in the temporal
lobe) may also contribute to these effects. Alterations in monoamine levels underlie this complex spectrum of psychotropic activity: stimulating, tranquilizing, anti-stress, and antidepressant.
T he authors have found that R. rosea can help
patients with depressive syndromes, mental and
physical fatigue (secondary to psychiatric and
medical conditions), memory loss and cognitive
dysfunction from a variety of causes, sexual dysfunction, and menopausal related disorders. Dr.
Brown and Dr. Gerbarg have successfully treated
more than 150 individuals with R. rosea extract
(3 percent rosavin and 1 percent salidroside)
and have supervised the treatment of more
than 100 additional cases (See Case Studies).
Effects on Physical Work Capacity
A number of studies have shown that R.
rosea increased physical work capacity and dramatically shortened the recovery time between bouts
of high intensity exercise. T hese studies included
normal individuals exposed to maximal work on a
bicycle ergometer and Olympic-level cross country
skiers and biathletes.69 In one study, 52 men (18–24 years of age)
were given one dose of either 15 drops of R. rosea extract, 2 ml
eleuthero, or 1 ml of a 1 percent solution piridrol (a stimulating
psychotropic similar to methylphenidate). Fifteen drops of R. rosea
extract is approximately equivalent to 150 mg of dry encapsulated
root extract standardized to 3 percent rosavin and 1 percent
salidroside. After 30 minutes, they pedaled an electric bicycle
ergometer to produce a precise amount of work-induced baseline
fatigue. After a 5-minute rest they performed further work to
determine the maximal duration of work they could accomplish at
a specific intensity. During the second period of work, R. rosea
drops, eleuthero extract, and piridrol increased work capacity by 9
percent, 6 percent, and 6 percent respectively (p<0.04) compared
to placebo controls. Recovery was defined by the time of normalization of heart rate and arterial pressure. During the
recovery period, at 10 minutes, the pulse slowed by
a factor of 2.5 (67 beats per minute) in the R. rosea
group versus 1.9 (87 beats per minute) in the control group. During the 3-day total recovery period, subjects given piridrol complained of
insomnia, excitability, and irritability; whereas
those given R. rosea had no adverse side
effects and no complaints.
Endurance is the capacity to maintain
work despite fatigue. Forty-two master
level competitive skiers (20–25 years of
age) took either R. rosea extract or placebo
30–60 minutes before training races (30
km) and a biathlon (20 km race on skis
carrying a rifle and shooting targets at
stops). Athletes given R. rosea had statistically significant increased shooting
accuracy, less arm tremor and better
coordination. T hirty minutes after work
performance, the heart rate in the R.
rosea group was 104–106 percent of
baseline, versus 128.7 percent in the placebo group (p<0.02). R. rosea improved
recovery time, strength, endurance, cardiovascular measures, and coordination.69
Adaptogens differ from other stimulants
during forced, exhaustive muscular work.
With classical stimulants the initial
increase in work-capacity is followed by
a period of substantially decreased
(markedly below average) work-capacity.
Repeated use of CNS stimulants depletes
brain catecholamines and decreases conditioned reflexes. In contrast, with extracts of
R. rosea , the initial increase in work-capacity
is followed by a lesser diminution, such that the work-capacity
continues to be above average.70
Animal studies suggest mechanisms that may be involved in
these effects. R. rosea increased essential energy metabolites,
adenosine triphosphate (AT P) and creatine phosphate in the
muscle and brain mitochondria in mice made to swim to their
limit.71 It may also enhance the ammonia reassimilation and energy metabolism of the cell by increasing AT P, ribonucleic acid
(RNA), protein and amino acid synthesis.72 In animal studies R.
rosea increased metabolism of fats twice as much as eleuthero73 and
improved energy metabolism in the brain during intensive muscular workloads.74
Above and left: Rhodiola rosea Oeder, G. C. [Flora Danica.] Icones plantarum
sponte nacentium in regnis Daniae et Norvegiae ... Hafniae, C. [& A.] Philibert,
1766 [i.e., 1761]-1883, vol. 2, plate 183. Coutesy of The Hunt Institute for Botanical
Docum entation.
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R ho di o l a r o s e a
A Phytomedicinal Overview
Adaptogenic, Anti-Stress, and
Neuroendocrine Effects
In their classic 1968 paper, Soviet pharmacologists Brekhman
and Dardymov surveyed the literature on 189 medicinal plants
and identified five (including R. rosea ) that met the three defining
criteria for an adaptogen:75
• An adaptogen should be innocuous and cause minimal disturbance of the normal physiological functions of an organism;
• T he action of an adaptogen should be nonspecific (i.e., it should
increase resistance to adverse influences of a wide range of harmful
factors of physical, chemical, and biological nature);
• An adaptogen may possess normalizing action irrespective of the
direction of the preceding pathological changes (i.e., if a body
parameter is high, the adaptogen brings it down towards normal;
if a parameter is low, the adaptogen brings it up towards normal).
Figure 1:
Rosavin
OH
H
O
H
O
HO
H
H
OH
H
H
O
O
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HO
H
HO
OH
H
H
T he forced swimming test, used by Russian scientists to measure
nonspecific resistance to stress, was later named after Porsolt who
assigned specific parameters such as water temperature and the
dimensions of the glass cylinder in which a mouse or rat was forced
to swim to exhaustion (about 15 minutes). After an initial period
of vigorous activity, the rodent adopts a characteristic immobile
posture, making only the minimal movements necessary to stay
afloat.76 T he validity of the Porsolt swim test and its relationship to
depression have been discussed extensively77,78 and it subsequently
became a screening test for antidepressant agents by pharmaceutical companies. Although different laboratories have made minor
technical modifications, the fundamentals of the test remain the
same. Adaptogens and antidepressants increase the amount of time
the animal is able to keep swimming actively.75 Panossian and colleagues propose to update the definition of adaptogen by highlighting more specific biochemical actions as metabolic regulators.70 T he wide range of medical benefits and physiological actions
may be based on the effects of adaptogens on regulatory systems
found in many organs and tissues (e.g., immune, hormonal, CNS,
cardiovascular, muscular, etc.). T hey hypothesize that adaptogens
reduce damage from stressors by altering the reactivity of the
organism’s defense system, including the hypothalamic pituitary
axis (HPA) and the efferent sympatho-adrenal system (SAS).70
A recent study showed that R. rosea and eleuthero protected the
embryos of fresh water snails (Lymnaea stagnalis) from a variety of
environmental stressors.79 Enhancement in resistance was studied
by applying phyto-adaptogen extracts for a period of 20 hours to
3-day old L. stagnalis larvae. Subsequently the larvae were exposed
to the following highly toxic environmental stressors: a physical
stress (heat shock: 43 degrees C for 4 minutes); an oxidative stress
46 | HerbalGram 56
(superoxide radicals induced by menadione 600 microM for 2
hours); and heavy metal-induced stress (copper 50 microM for 1
hour or cadmium 20 microM for 1 hour). Both eleuthero and R.
rosea strongly protected snail embryos from lethal heat shock, from
the adverse effects of menadione-induced superoxide radicals, and
from toxic exposure to heavy metals (copper and cadmium).
Although the degree to which resistance was enhanced depended
on the type of stressor applied, these results confirm the definition
of phyto-adaptogens as being universal enhancers of non-specific
resistance against different kinds of stress conditions. T he mechanisms of nonspecific resistance are not entirely clear, but probably
involve improvements in cellular energy metabolism, based in part
on AT P (as discussed above).
In higher animals and humans, nonspecific resistance may also
be enhanced by improvements in the neurological mechanisms of
dealing with stress (catecholamines, serotonin, and endorphins).
T he serotonin system is necessary for the stress response reaction,
adaptation to new environmental conditions, and tolerance of
hypoxia. Numerous stressors decrease serotonin in the hypothalamus. T heoretically, the ability of R. rosea to increase the nonspecific resistance of animals may be related to its capacity to increase
serotonin in the hypothalamus and midbrain. Additional research
showed that an intact hypothalamic pituitary adrenal axis and participation of the gonads and thymus were necessary for this antistress effect.2 Furthermore, R. rosea reduces the activation of several components of the stress response system. For example, it modestly increased serum beta-endorphins that protected rats against
subsequent stress induced excess endorphin elevation.80 In addition, R. rosea moderates the release of opioid peptides that occurs
as part of the pituitary adrenal axis response to stress. T his reduced
release protects against sudden excess opioid and catecholamine
(NE and DA) levels, (which interfere with normal brain functions
and can lead to heart damage), while allowing a more moderate
release that increases stress tolerance without damaging the central
nervous system or the cardiovascular system (see Diagram 2). R.
rosea extracts also protect the brain and heart by reducing the secretion of corticotrophin releasing factor (CRF) under stress.80,81
Figure 2:
Rosin
HO
H
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HO
OH
H
H
Endocrine and Reproductive Effects
Neuroendocrine animal studies showed that R. rosea , like other
adaptogens, enhanced thyroid function without causing hyperthyroidism.81 In addition, the thymus gland functioned better and was
protected from the involution that occurs with aging. T he adrenal
glands functioned with better reserve and without the kind of
hypertrophy caused by other psychostimulants.
Egg maturation was enhanced in rats and an anabolic effect in
males (increase muscle building and gonad strengthening similar
to effects of low dose testosterone) was observed in a number of
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species. Administration of rhodosin (extract of R. rosea for intravenous, intramuscular, or peritoneal injection) to sexually mature
female mice over a period of 4 weeks prolonged menstruation from
1.3 days (control) to 2.8 days (rhodosin treated), reduced the resting period from 3.8 days (control) to 2.2 days (rhodosin treated),
and increased the relative number of estrous days from 29 percent
to 56 percent. In the majority of rhodosin treated animals, the
number of growing follicles, the oocyte volumes, the accumulation
of RNA in oocyte cytoplasm, the proliferation of the lining and
glandular cells of the uterine horns, and the preparation of uterine
mucosa for fertilization all increased. In sexually mature mice rhodosin increased the mean weight of the uterine horns from
39.6+4.11 mg to 59.5+1.59 mg and the mean weight of the ovaries
from 6.4+0. 65 mg to 9.1+0.45 mg. However, the administration
of rhodosin to sexually immature female white mice for 3 weeks
did not affect sexual maturation, the onset of estrus, the weight of
ovaries or uterine horns, or the maturation of follicles. T hus, it is
probable that the estrogenic effects of R. rosea preparations depend
upon a specific hormonal milieu.82,83
T hese pre-clinical investigations led to a study of R. rosea extract
in women suffering from amenorrhea (loss of menstrual cycles).
Forty women with amenorrhea were given R. rosea (either 100 mg
R. rosea extract orally twice a day for 2 weeks, or 1 ml rhodosin
intramuscularly for 10 days). In some subjects the treatment cycle
was repeated 2–4 times. Normal menses was restored in 25
women, 11 of whom became pregnant. In those with normal
menses, the mean length of the uterine cavity increased from 5.5
cm to 7.0 cm (normal) after R. rosea treatment.82, 83 One of the
authors (Dr. Brown) has treated in his practice several women who
had failed to conceive with standard fertility drugs, and who
become pregnant within several months of beginning R. rosea
extract. T hese preliminary clinical observations warrant controlled
follow-up clinical trials. Using the in vitro estrogen receptor competition assay, Patricia Eagon, Ph.D., (personal communication,
December 2001) recently found that R. rosea extract showed
strong estrogen binding properties that require further characterization.
In an open study, 26 out of 35 men with erectile dysfunction
and/or premature ejaculation (of 1–20 years duration) responded
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to R. rosea (150–200 mg/day for 3 months) with substantially
improved sexual function, normalization of prostatic fluid, and an
increase in 17-ketosteroids in urine.56,69
Cardioprotective Effects
Cardioprotective effects of R. rosea include: prevention of stressinduced cardiac damage,80,81,84 decreased myocardial catecholamines
and cyclic adenosine monophosphate (cAMP) levels; and reduced
adrenal catecholamine release80,81 (see Figure 2). Furthermore, R.
rosea activation of mu-opiate receptors in heart muscle prevented
reperfusion arrhythmias in animal hearts. T his effect could be
blocked by naloxone injection (known to inhibit mu-opiate receptors), thus confirming that the anti-arrhythmic effect of R. rosea is
associated with the mu-opiate receptors in myocardial (heart) muscle.84
In a series of joint Swedish and Russian double-blind randomized placebo-controlled studies,85 10 healthy but sedentary men
(ages 20–31 years) were evaluated. Twenty percent of the subjects
had average physical work capacity as measured by Power Work
Capacity (PWC-170) and 80 percent had below average PWC170, indicating a low level of physical training (PWC-170 is a calculation based on the amount of work performed by a man if his
heart rate reaches 170 beats per minute,
bpm). A sequence of complex 1- to 7day trials compared the effects of an
adaptogen formula, a mixture of monoand polyphenolic adaptogens (MMPA).
Each tablet contained the following
ingredients: 3 mg rhodioloside from R.
rosea root extract, 50 mg; 3 mg total sum
of isofraxidine-, syringine-, and
syringaresinoie-glycosides
from
eleuthero root extract, 100 mg; and 4
mg schizandrine and gamma-schizandrine from schisandra (Schisandra chinensis (Turcz.) Baill., Lamiaceae) fruit
extract, 150 mg.
During the 7-day adaptogen trial, subjects were given 3 capsules (containing a
total of 150 mg R. rosea ) twice a day on
days 1–3; 4 capsules (200 mg R. rosea )
twice a day on days 4–6, and 4 capsules
once on day 7. T he mean increase in
physical work capacity was 28 percent
with dosed physical loads in subjects
treated with the adaptogen formula. T hus, sedentary subjects given
the adaptogen were able to perform in the lower level of trained
athletes without any exercise training. T heir heart rate variability
and inotropic (strength of heart muscle contractility) functions
improved.
Both the sympathetic and parasympathetic inputs to the heart
were enhanced such that the heart showed increased reserves under
stress of greater intensity. T he autonomic nervous system controls
automatic or involuntary functions of the body. It has two components: the sympathetic and the parasympathetic nerves (see Diagram 2). T he sympathetic nervous system is the “fight-or-flight”
system that helps the organism respond to stress (e.g., by increasing heart rate, respiratory rate, and muscle tone). T he parasympathetic nervous system conserves and restores energy (e.g., by slowing the heart rate, respiratory rate, and metabolism). By enhancing the
R ho di o l a r o s e a
A Phytomedicinal Overview
2002
HerbalGram 56 | 47
R ho di o l a r o s e a
functions of the sympathetic and parasympaA Phytomedicinal Overview
thetic systems, R. rosea
enables the organism to
put out more energy during stress while at the same time maintaining higher energy reserves. One of the challenges presented by
research on a multi-ingredient formula is that it is not usually possible to attribute the results to the activity of any one single herbal
component. However, the results of this study are consistent with
results of other research conducted solely on R. rosea monopreparations.
into mice) and normal bone marrow cells in two mouse cancer
models.90 One group of mice with Ehrlich ascites tumor (EAT ) and
another group with Lewis lung carcinoma (3LL) were first treated
with 100 mg/kg cyclophosphamide (a chemotherapy agent) that
suppressed tumor growth to 31–39 percent and limited 3LL
Figure 3:
Rosarin
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Antioxidant and Anti-carcinogenic Effects
R. rosea is rich in phenolic compounds, known to have strong
antioxidant properties.53,86 Animal studies have shown that R. rosea
decreases toxicity from cyclophosphamide, rubomycin, and adriamycin (anti-cancer drugs), while it enhances their anticarcinogenic effects.87-89 Udintsev and Schakhov studied the effect of R.
rosea root extract (RRRE), a tincture manufactured according to
the Russian Pharmacopoeia standards (minimum 0.8 percent
salidroside and 3 percent rosavin), on tumor cells (transplanted
H
H
OH
OH
H
H
metastases to 18 percent, while also reducing the number of normal bone marrow cells, leucocytes and myelokariocytes, to 40–50
percent and 20–25 percent of normal respectively. In comparison
RRRE, 0.5 mg/kg/day given orally 2–8 days after tumors had been
transplanted, suppressed growth of both tumors by 19–27 percent
and 3LL metastases 16 percent. However, in contrast to cyclophosphamide, RRRE caused no reduction in normal bone marrow
Clinical Case Studies
he following cases are representative examples of the many
clinical situations in which R. rosea may be beneficial.
Although the presentation of individual cases does not carry the
weight of double-blind placebo-controlled trials, the authors
hope that these samples from their larger case series may help to
generate interest and funding for future controlled clinical trials
to explore the medical applications of this multipotent medicinal
herb. Note that in some cases the patients served as their own
controls by discontinuing R. rosea , relapsing, and then improving
upon resumption of treatment.
Ms W. , a 45 year-old writer, never quite finished her doctoral
thesis. A “block” prevented her from completing any manuscripts
for publication. Seven years of psychotherapy did not alleviate the
problem. After “drifting” for years and being terrified of taking
any more prescription antidepressants, she tried 100 mg extract
of R. rosea (Rosavin™ , a preparation standardized to 1 percent
salidroside and 3 percent rosavin, Ameriden International, Fallbrook, CA) twice a day. Although she had not considered herself
to be depressed (nor meet criteria for dysthymic disorder), within 6 weeks she experienced a new sense of enthusiasm and
increased productivity. She became able to complete writing projects and to feel happy with herself. She was well for over two years
on R. rosea . However, feeling recovered and happily married, she
decided on her own to stop the herbal medicine and gradually
relapsed over 6 months. Upon resuming the R. rosea , she again
improved with full recovery.
Ms. P. , a 50 year-old computer analyst, complained of constant
fatigue, dragging herself out of bed every morning, and dreading
encounters at work. Because she was highly sensitive to side
effects of any psychotropic medication, she began with one pinch
(equivalent to about 50 mg) of R. rosea extract (Rosavin) in her
morning tea. Within a few days her fatigue was gone. She had the
energy and confidence to deal more effectively with the inevitable
conflicts at work.
Ms. B. , a 45 year-old mental health professional, had refractory depression and fibromyalgia for 5 years. Her symptoms were
completely unresponsive to multiple trials of psychotropic med-
T
48 | HerbalGram 56
ication. She had a partial response to the antidepressant sertraline
(Zoloft® , a selective serotonin reuptake inhibitor, SSRI), but this
was not adequate for her to do more than carry out her daily job.
T he addition of 600 mg/day R. rosea extract (Rosavin) enabled
her to return to normal enjoyment and full productivity in life. It
took about 2 months to see these effects. After 6 months, the
patient began to doubt that she needed the R. rosea and discontinued it on her own, only to relapse over the next 3 weeks. Upon
reinstitution of the R. rosea she returned to full remission and
remains well 2 years later on sertraline and R. rosea .
Mr. S. , a 74 year-old man, had suffered from Parkinson’s disease for 10 years. Despite conventional treatment with pramipexole (Mirapex® ), levodopa/carbidopa (Sinemet® ), donepezil (Aricept® ), and rivastigmine (Exelon® ) for motoric and cognitive
deficits, he was functioning poorly. He spent most of the day sitting in a chair, rarely speaking or initiating any activities. His
wife, a practicing neurologist, carefully observed his clinical status and reported that within one week of starting 300 mg R. rosea
extract (Rosavin) twice daily he began to recover with marked
progressive improvements in his abilities to think, speak, read,
and initiate independent activities. Because of some residual cognitive impairment, galanthus (Galanthus spp., Amaryllidaceae) an
herbal extract (customized formula by Ameriden International
containing 100 mg R. rosea , 200 mg galanthus, and 50 mg plant
cell-derived vitamin C) was added with consequent additional
improvement.
Ms. A. , an athletic 62 year-old Oriental woman, was diagnosed
with infiltrating ductal carcinoma of one breast. She began
chemotherapy but suffered extreme fatigue and suppression of
her white and red blood cell counts to the point where, despite
conventional treatment adjuvants, the chemotherapy regimen
had to be repeatedly interrupted. A trial of 150 mg R. rosea
extract (Rosavin) twice daily restored her energy and completely
normalized her white and red blood cell counts, allowing completion of chemotherapy. Four months after mastectomy and
chemotherapy, Ms. A. resumed her usual rigorous martial arts
practice.
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w w w.herbalgram .org
cells. In animals given both RRRE and cyclophosphamide, the
RRRE increased the antimetastatic effect of cyclophosphamide by
36 percent (p<0.05). RRRE also increased the number of leukocytes by 30 percent and myelokariocytes by 16–18 percent.
In another mouse tumor model, Udintsev and colleagues
showed that RRRE (minimum 0.8 percent salidroside and 3 percent rosavin) increased the antitumor effect of the drug adriamycin
while substantially reducing its liver toxicity.89 Many chemotherapy agents are hematotoxic (reduces the number of normal blood
cell precursors in bone marrow) or hepatotoxic (causes damage to
the liver). T hese serious side effects were significantly ameliorated
by RRRE. T hus, the research suggests that RRRE can both
enhance tumor inhibition by chemotherapeutic drugs while alleviating dangerous side effects.
Figure 4:
Tyrosol
HO
Rhodiola rosea One year old seedlings. Photo © 2002 Zakir Ram azanov, Ph.D.,
D.S.
OH
Substances that reduce the incidence of chromosomal aberrations are termed antimutagenic. Salikhova and colleagues found
that in mice injected with cyclophosphamide, RRRE (minimum
0.8 percent salidroside and 3 percent rosavin) had antimutagenic
effects.91 Compared to placebo controls, RRRE reduced the development of chromosomal aberrations by 50 percent and reduced
the incidence of cells with micronuclei by more than 50 percent.
RRRE also increased indices of DNA repair in bone marrow cells
after exposure to the mutagen N-nitroso-N-methylurea (NMU).91
In a small pilot study of 12 patients with superficial bladder carcinoma (T IG1-2), treatment with RRRE (minimum 0.8 percent
salidroside and 3 percent rosavin) improved parameters of leukocyte integrines and T-cell immunity.92 T he average frequency of
relapse was reduced, but did not reach statistical significance. Larger placebo-controlled studies of R. rosea extracts to augment tumor
inhibition and reduce toxic effects of chemotherapy agents are
needed.
Toxicity, Side Effects and Contraindications
R. rosea has a very low level of toxicity. In rat toxicity studies, the
LD 50 (lethal dose at which 50 percent of animals die) was calculated to be 28.6 ml/kg, approximately 3,360 mg/kg.25 T he equivalent
dosage in a 70 kg man would be about 235 gm or 235,000 mg.
Since the usual clinical doses are 200–600 mg/day, there is a huge
margin of safety.87
Overall, R. rosea has very few side effects. Most users find that it
improves their mood, energy level, and mental clarity. Some individuals, particularly those who tend to be anxious, may feel overly
activated, jittery, or agitated. If this occurs, then a smaller dose
with very gradual increases may be needed. R. rosea should be
taken early in the day because it can interfere with sleep or cause
vivid dreams (not nightmares) during the first few weeks. It is contraindicated in excited states. Because R. rosea has an activating
antidepressant effect, it should not be used in individuals with
bipolar disorder who are vulnerable to becoming manic when
given antidepressants or stimulants. Until this has been further
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studied, the authors advise caution in patients with bipolar spectrum disorders. T he herb does not appear to interact with other
medications, though it may have additive effects with other stimulants. It is best absorbed when taken on an empty stomach 30
minutes before breakfast and lunch. As with any herbal preparation, patients should inform their primary healthcare practitioner
when taking R. rosea .
Figure 5:
Salidroside
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Rhodiola in the Future
More scientific research is needed to confirm the preventive and
curative benefits of R. rosea . Controlled studies are warranted to
explore its use in antidepressant augmentation, attention deficit
disorder, traumatic brain injury, Parkinson’s disease, protection
against arrhythmias, sports performance, aviation and space medicine (enhancing physical and mental performance while reducing
stress reactions), endocrine disorders (infertility, premenstrual disorder, menopause), sexual dysfunction, disorders of the stress
response system (fibromyalgia, chronic fatigue syndrome, and post
traumatic
stress
disorder),
and
enhancement
of
chemotherapy/radiation with amelioration of toxicity.
In the course of evolution, R. rosea has adapted to the harsh conditions of high altitude (extreme cold, low oxygen, little rainfall,
and intense irradiation from the sun) by producing a group of
powerful protective compounds that have diverse beneficial effects
in animals and humans.
One is struck by the versatility of R. rosea , from
its description in Greek
R ho di o l a r o s e a
A Phytomedicinal Overview
2002
HerbalGram 56 | 49
R ho di o l a r o s e a
medicine, 2000 years
ago to its use by 20th
A Phytomedicinal Overview
century cosmonauts. It
is time for modern
research, using controlled clinical trials, to develop the potential
medical applications of this unique phyto-adaptogen.
Richard P. Brown, M.D., is Associate Clinical Professor of Psychiatry at Columbia University College of Physicians and Surgeons in
New York City. He received his M.D. in 1977 from Columbia University College of Physicians and Surgeons in New York. Dr. Brown
completed his Residency in Psychiatry and a Fellowship in Psychobiology and Psychopharmacology at New York Hospital. Dr. Brown is the
recipient of numerous awards, including a Mead-Johnson Neuropsychopharmacology Travel Fellowship, a Mallinckrodt Scholar award,
and a Fellowship in Neurosciences and Brain Imaging from the Dana
Foundation. He has had a longstanding interest in herbal and complementary medicine, especially as relevant to psychiatry. In 2000, he
co-authored the book, Stop Depression Now, which presents a holistic approach to the treatment of depression, including SAM-e. Since
1999, Dr. Brown has taught a full day course on Herbs and Nutrients
in Psychiatry at the annual meetings of the American Psychiatric Association. Dr. Brown has no financial interest in Rhodiola rosea.
Roots of 5 year old cultivated Rhodiola rosea . L. Mikkeli, Finland, 2002
Photo © 2002 Zakir Ram azanov, Ph.D., D.S.
Patricia L. Gerbarg, M.D., is Assistant Clinical Professor in Psychiatry at New York Medical Center. She graduated from Harvard
Medical School in 1975 and completed her Psychiatry Residency at
Beth Israel Hospital in Boston in 1979. She finished psychoanalytic
training at the Boston Psychoanalytic Society and Institute in 1992
and has maintained a private psychiatric practice for 23 years. Dr.
Gerbarg has taught and lectured on a range of topics in psychiatry and
psychoanalysis. Over the past eight years she has been increasingly
involved in research and writing about alternative and complementary medicine in psychiatry and has co-authored numerous articles and
book chapters with Dr. Brown. Dr. Gerbarg has no financial interest
in Rhodiola rosea.
Zakir Ramazanov, Ph.D., D.S., is Professor of Biochemistry at Las
Palmas Technological Institute, Spain. In 1978 he received a bachelor’s degree with a double major in biochemistry and plant physiology
from North Caucasian State University and in 1981 a Ph.D. in Plant
50 | HerbalGram 56
Physiology and Biochemistry from the Soviet Academy of Sciences. He
has served as Senior Scientist and Chief of the Department of Biotechnology at the Soviet Academy of Science and as Chairman of Algal
Biotechnology Development. In 1991 he accepted a research fellowship
at Louisiana State University. The recipient of numerous research
grants, Dr. Ramazanov is known for his work in space biology, the
cultivation of photosynthetic organisms in space stations, and the
development of marine natural products from sea vegetables. He has
published more than 140 scientific studies and co-authored two books:
Arctic Root (Rhodiola rosea) — T he powerful new Ginseng Alternative (1998) and Effective Natural Stress and Weight Management Using Rhodiola Rosea and Rhododendron Caucasicum
(1999). Dr. Ramazanov is President and CEO of National Biosciences Corporation, Chester, NY.
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