Rhodiola Rosea: Benefits, Dosing, Forms, and Side Effects

Rhodiola Rosea: Benefits, Dosing, Forms, and Side Effects

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Rhodiola rosea (L.) is a perennial flowering plant that grows in cold, high-altitude regions of Eastern Europe (particularly Siberia), Asia, and certain mountainous or coastal areas of North America and Scandinavia [1][2][3]. The plant belongs to the Crassulaceae family and is commonly known as "golden root," "rose root," "arctic root," "rosenroot," or "king's crown" [2][3]. It has a long history of traditional use in Russia and Scandinavia for improving work performance, physical endurance, fatigue resistance, depression, and altitude sickness [3].

Today, rhodiola is marketed primarily as an "adaptogen" — a substance believed to help the body adapt to physical and mental stressors by modulating the hypothalamic-pituitary-adrenal (HPA) axis and stress-response pathways [1][3][4]. It is sometimes promoted as the "new ginseng" due to these purported adaptogenic properties [1].

The pharmacologically active compounds in rhodiola root include two key groups:

  • Rosavins (rosavin, rosarin, and rosin): Phenylpropanoid glycosides found specifically in R. rosea root, serving as key marker compounds that distinguish R. rosea from other rhodiola species [1][5]. Typical standardization targets approximately 3% rosavins.
  • Salidroside (also called rhodioloside): A phenylethanol glycoside found in the root that, both alone and in combination with rosavins, may be responsible for some of the herb's antidepressant and stress-modulating effects [1][6]. Its metabolite, tyrosol, also shows bioactivity. Typical standardization targets approximately 1% salidroside.

Research suggests that a fixed preparation containing salidroside, rosavin, rosarin, and rosin is "more active than any of the individual components alone, indicating a synergistic effect" [6]. This is why most clinical research uses standardized whole-root extracts rather than isolated compounds.

The overall evidence base for rhodiola remains preliminary. The U.S. National Center for Complementary and Integrative Health (NCCIH) states that "there isn't enough reliable evidence to determine whether rhodiola or its components are useful for any health-related purpose" and that "most of the research in people is of low-to-moderate quality" [3]. Small, short-term studies suggest several potential uses, but larger, well-controlled, long-term studies are needed to confirm these findings [1].

Table of Contents

Overview

Rhodiola rosea L. is a perennial flowering plant that grows in cold, high-altitude regions of Eastern Europe (particularly Siberia), Asia, and certain mountainous or coastal areas of North America and Scandinavia [1][2][3]. The plant belongs to the Crassulaceae family and is commonly known as "golden root," "rose root," "arctic root," "rosenroot," or "king's crown" [2][3]. It has a long history of traditional use in Russia and Scandinavia for improving work performance, physical endurance, fatigue resistance, depression, and altitude sickness [3].

The root contains two key classes of bioactive compounds:

  • Rosavins (rosin, rosarin, and rosavin): Phenylpropanoid glycosides that serve as marker compounds to distinguish R. rosea from other rhodiola species [1][5].
  • Salidroside (also called rhodioloside): A phenylethanol glycoside that, in combination with rosavins, may be responsible for some of the herb's antidepressant effects [1][6]. Its metabolite tyrosol also shows bioactivity.

Research suggests that a fixed preparation containing multiple rosavins and salidroside is "more active than any of the individual components alone, indicating a synergistic effect" [6]. This is why most clinical research uses standardized whole-root extracts.

The overall evidence base remains preliminary. The U.S. National Center for Complementary and Integrative Health (NCCIH) states there is "insufficient reliable evidence to determine whether rhodiola is useful for any health-related purpose," with "most of the research in people being of low-to-moderate quality" [3]. Small, short-term studies suggest several potential uses, but larger, well-controlled, long-term studies are needed [1].

Because R. rosea is primarily wild-harvested with limited large-scale cultivation, there is significant potential for adulteration with cheaper rhodiola species (R. crenulata, R. heterodonta, R. quadrifida) or other ingredients [1][5]. Products labeled simply "Rhodiola" without specifying the species may contain these alternatives, which have different phytochemical profiles.

Forms and Bioavailability

Extract vs. Root Powder

Most clinical trials have used standardized extracts of R. rosea root or rhizome, not raw root powder. The distinction matters because extracts concentrate the active compounds (rosavins and salidroside) to defined levels, allowing for consistent dosing across studies.

Rhodiola supplements are available in several forms:

  • Standardized extracts (3% rosavins, 1% salidroside) — the most clinically studied form, with doses of 200–680 mg/day used in the majority of trials. Look for extracts standardized to at least 3% rosavins and 1% salidroside.
  • Standardized extracts (other ratios) — some products standardize to total rosavins plus salidroside combined, with doses of 170–400 mg/day.
  • Root powder — ground dried root; lower concentrations of active compounds than extracts. One clinical trial using powdered root standardized to 2.8% rosavins (364–546 mg/day) actually worsened fatigue compared to placebo [10], highlighting the importance of extract form.
  • Combined formulations — root powder plus extract. Less studied than pure standardized extracts.

Key Standardized Extracts Used in Research

SHR-5: A Swedish proprietary extract standardized to 3.07% rosavins and 1.95% rhodioloside (salidroside). This is the most extensively studied rhodiola extract, used in trials on depression [7][8], mental fatigue [11], and cognitive function [12]. It does not currently appear to be commercially available in the U.S. [1].

WS 1375 (Vitano): A proprietary extract from Dr. Willmar Schwabe GmbH & Co. KG, marketed as Rosavin. Chemical composition is not fully disclosed. Used in at least one anxiety study at 400 mg/day [13].

Rhodax: An extract from Phoenix Laboratories by Bodyonics Ltd., standardized to contain a total of 30 mg of rosavins, salidroside, and other compounds (rhodalgin, acetylrhodalgin, rosaridin, rosaridol) per 170 mg tablet. Used in an open-label anxiety study [9].

Identifying Quality Products

When selecting a rhodiola supplement, the following factors help ensure the product is consistent with clinical evidence [1]:

  • Species: Look for Rhodiola rosea specifically listed on the label, not just "Rhodiola." The FDA permits labels to list "Rhodiola" without specifying the species because it is listed as a common commercial term in Herbs of Commerce — but this definition covers four possible rhodiola species [1].
  • Plant part: Root or rhizome. These are the plant parts used in clinical research and where the active compounds are concentrated.
  • Standardization: Preferably an extract standardized to approximately 3% rosavins and 1% salidroside, which mirrors the SHR-5 extract used in most studies. A minimum of 1.5% rosavins and 0.4% salidroside is reasonable [1].
  • Extract amount: At least 200–680 mg of extract per day, consistent with effective doses in clinical trials [1].

Adulteration Concerns

Because R. rosea is primarily wild-harvested and demand is high, there is a significant risk of adulteration with other rhodiola species [1][5]. An analysis by Booker et al. (2015) in Phytomedicine confirmed that rosavins can help distinguish R. rosea from other species, making rosavin content an important quality marker [5]. Supplements that do not disclose rosavin content may contain substituted or diluted material.

Evidence for Benefits

Depression

Depression is the most extensively studied indication for rhodiola, though the evidence remains modest.

Darbinyan et al. (2007) — Mild to Moderate Depression [7]: A double-blind, randomized, placebo-controlled study of 89 men and women with mild to moderate depression tested an R. rosea extract (SHR-5, standardized to 3.07% rosavin and 1.95% rhodioloside) at two dose levels: 340 mg/day and 680 mg/day for six weeks. Both doses improved most symptoms of depression, including insomnia and emotional stability, while the placebo group showed no improvement. At the end of six weeks, participants taking 680 mg daily also had significant increases in measures of self-esteem, while those taking the lower dose did not.

Mao et al. (2015) — NIH-funded Comparison with Sertraline [8]: A well-controlled study funded by the U.S. National Institutes of Health compared R. rosea extract (SHR-5) to sertraline (Zoloft, 50 mg) and placebo in 57 people with mild to moderate major depressive disorder over 12 weeks. Key findings:

  • Modest reductions in depression scores were observed with R. rosea, though these were only somewhat better than placebo and not as large as with sertraline.
  • Improvements with either active treatment were not statistically significant compared to placebo, partly due to the small sample size.
  • Adverse events were substantially less common with R. rosea (30.0%) compared to sertraline (63.2%) and even placebo (16.7%).
  • The researchers concluded that although R. rosea had less antidepressant effect than sertraline, it "may possess a more favorable risk to benefit ratio" for mild to moderate depression.
  • Dosing started at one capsule (340 mg) daily and was increased by one capsule every two weeks in non-responders, up to a maximum of four capsules daily (1,360 mg/day).
  • No clinically meaningful differences in blood pressure, heart rate, or weight were observed between groups.

Gao et al. (2020) — Combination with Sertraline [14]: A randomized, double-blind, placebo-controlled trial examined rhodiola capsules combined with sertraline for major depressive disorder. This study, referenced by the NCCIH, adds to the evidence that rhodiola may have adjunctive value in depression treatment [3].

Mechanism: The exact mechanism by which R. rosea may improve depression symptoms is not fully understood. Animal research suggests the herb may modify the body's stress response and interact with brain chemicals that affect mood [15]. One study found that salidroside and its metabolite tyrosol had the strongest antidepressant effect in rat models, though a fixed preparation containing multiple compounds was more active than any individual component, suggesting synergistic effects [6]. Some in-vitro studies suggest R. rosea may inhibit monoamine oxidase (MAO) activity [16][17], but this effect was NOT observed when the extract was given orally in an animal study [18], and no human studies exist on MAO inhibition. This discrepancy between in-vitro and in-vivo results is important to note.

Clinical guidelines: The World Federation of Societies of Biological Psychiatry (WFSBP) and the Canadian Network for Mood and Anxiety Treatments (CANMAT) include rhodiola in their clinician guidelines for the treatment of psychiatric disorders with nutraceuticals and phytoceuticals [19], though the level of recommendation reflects the limited evidence base.

Anxiety

Evidence for rhodiola in anxiety disorders is very preliminary, limited to small studies with significant methodological limitations.

Cropley et al. (2015) — Mild Anxiety in Young Adults [13]: A study in young adults with mild anxiety tested a proprietary R. rosea extract (WS 1375/Rosavin) at a total daily dose of 400 mg (200 mg taken 30 minutes before breakfast and 200 mg taken 30 minutes before lunch) for two weeks. Those taking the extract reported significantly lower levels of anxiety and improved mood compared to those who did not take the extract. However, this study did not include a placebo, and all measures of anxiety were self-reported, significantly limiting the conclusions that can be drawn.

Bystritsky et al. (2008) — Generalized Anxiety Disorder [9]: An open-label study of ten men and women diagnosed with generalized anxiety disorder (GAD) tested R. rosea extract (Rhodax, 170 mg per tablet standardized to 30 mg total rosavins, salidroside, and other compounds) at 340 mg/day for ten weeks. Key findings:

  • Significant decreases in measures of anxiety were observed across the group.
  • Five of ten participants (50%) had a decrease of 50% or more in anxiety scores.
  • Four of the five responders met the criteria for remission of anxiety.
  • Side effects were mild to moderate, including dizziness, dry mouth, nausea, and headache.

Due to the small sample size (n=10), lack of a control group, and lack of blinding, no definitive conclusions can be drawn from this study [9]. The results are hypothesis-generating only.

Physical and Mental Fatigue

Although rhodiola is widely promoted for reducing fatigue, the evidence is mixed, with small studies showing contradictory results.

Darbinyan et al. (2000) — Night Shift Physicians [11]: A double-blind, cross-over study of 56 healthy young physicians performing night duty work tested one tablet of R. rosea extract (SHR-5, containing 170 mg extract with 4.5 mg salidroside) once daily for two weeks. The extract significantly improved mental fatigue as measured by cognitive testing of short-term memory, calculation ability, and concentration after night shifts compared to placebo. No adverse effects were reported. However, as noted in a systematic review by Ishaque et al. (2012), the fatigue index used in this study does not appear to be validated, and the lack of certain methodological data makes it difficult to draw firm conclusions [20].

Spasov et al. (2000) — Student Exam Stress [12]: A double-blind, placebo-controlled pilot study using 50 mg of SHR-5 extract taken twice daily (100 mg/day total) in students aged 17–19 during a 20-day exam period found a 50% improvement in a measure of hand-eye coordination (maze test) and decreased self-reported scores of mental fatigue compared to placebo. Less of an increase in heart rate during a physical fitness test was also observed. However, other measures of motor and cognitive performance, including motor speed (finger tapping test) and mental work capacity (correcting written text), were NOT improved compared to placebo. Mild side effects including dizziness and headache were reported [12].

Punja et al. (2014) — Nursing Students [10]: A study of 40 nursing students aged 18–55 who took R. rosea root powdered extract standardized to 2.8% rosavins at either 364 mg or 546 mg daily or placebo for 42 days found that both physical and mental fatigue actually worsened in those taking the extract compared to placebo. Adverse events including headache, nausea, and diarrhea were similar to placebo and were mild to moderate. Two adverse events — dark stool and blurred vision — were reported by one participant each only in the rhodiola group [10].

Counterintuitively, a review of ten RCTs concluded there is currently insufficient evidence to determine whether R. rosea benefits fatigue [20]. This finding from Ishaque et al. (2012) in BMC Complementary and Alternative Medicine remains the most comprehensive synthesis of the fatigue evidence.

Athletic and Exercise Performance

Rhodiola is frequently marketed for improving exercise performance and endurance, but the evidence is weak. Most studies involve extremely small sample sizes and report only minor benefits, if any, compared to placebo.

De Bock et al. (2004) — Endurance [21]: A small study tested a single 200 mg dose of R. rosea extract (3% rosavin, 1% salidroside) on physical performance. Time to exhaustion during a cycling test increased slightly from 16.8 to 17.2 minutes (a 2.4% improvement), but there was no increase in muscle strength or reaction time compared to placebo. When a subset of participants took the same dose daily for four weeks, there was no improvement in any measures of physical performance. This study is notable because it suggests an acute single-dose effect that does not persist with chronic use.

Noreen et al. (2013) — Perceived Exertion in Women [22]: A study in 18 women tested acute R. rosea supplementation at 3 mg per kg of bodyweight (providing 3% rosavin and 1% salidroside) taken one hour before exercise. The extract appeared to decrease ratings of perceived exertion (RPE) during a bicycle endurance test compared to placebo, suggesting participants felt the exercise was easier despite similar physiological workloads.

Duncan et al. (2014) — Perceived Exertion in Men [23]: A similar study in 10 men using the same dosing protocol (3 mg/kg body weight, taken one hour before exercise) showed a modest decrease in RPE compared to placebo and significantly increased self-reported scores of "pleasure" and "vigor," but no effect on heart rate or energy expenditure. The subjective improvements without corresponding physiological changes raise questions about whether the effect is primarily psychological.

Walker et al. (2007) — Resistance Exercise Recovery [24]: A study of 12 resistance-trained men who took 1,500 mg/day of R. rosea (standardized to 3% rosavins) for 4 days before a resistance exercise session found no improvement in RPE or measures of muscle recovery compared to placebo — this is notable as the dose used was substantially higher than in most other studies.

Sanz-Barrio et al. (2023) — Systematic Review [27]: The most comprehensive review to date concluded that the evidence is inconsistent and does not strongly support rhodiola for enhancing athletic performance [3].

The overall evidence does not support rhodiola as an effective ergogenic aid. The small and inconsistent effects observed in some studies — primarily reduced perceived exertion rather than actual physiological improvements in power output, VO₂max, or strength — are insufficient to draw firm conclusions. Acute single-dose effects on RPE have been observed in some studies but do not translate to chronic performance benefits.

Cognitive Function

Rhodiola is promoted for improving cognitive performance, but the evidence is limited and largely derived from the fatigue studies described above.

Crawford et al. (2021) — Systematic Review [28]: A systematic review of dietary supplement ingredients for optimizing cognitive performance among healthy adults found some evidence of acute cognitive benefits with rhodiola, particularly under conditions of stress or fatigue, but the overall quality of evidence was low [3].

The cognitive effects observed in fatigue studies — improvements in short-term memory, calculation ability, and concentration after night shifts [11], and improved hand-eye coordination during exam stress [12] — suggest rhodiola may support cognitive function specifically when performance is impaired by stress or sleep deprivation, rather than enhancing baseline cognitive abilities in well-rested, non-stressed individuals. No large, well-controlled trials have specifically examined rhodiola for cognitive enhancement as a primary endpoint in healthy, non-fatigued adults.

Stress Response and Adaptogenic Effects

The adaptogenic properties of rhodiola are central to its marketing, though the concept of "adaptogens" itself lacks a precise pharmacological definition.

Panossian et al. (2010) [15]: Research has explored the molecular mechanisms by which R. rosea may modulate the stress response. Proposed mechanisms include:

  • Modulation of cortisol and other stress hormones through the HPA axis.
  • Interaction with neurotransmitter systems including serotonin, norepinephrine, and dopamine.
  • Regulation of molecular chaperones (heat shock proteins) involved in the cellular stress response.
  • Effects on neuropeptide Y, a stress-mediating peptide.

Lopresti et al. (2022) [4]: A systematic review of human trials examining HPA axis modulation by plants and phytonutrients included rhodiola among the herbs with some evidence for stress-response modification in humans, though evidence quality was limited.

Tao et al. (2019) [29]: A comprehensive review of rhodiola species covering traditional use, phytochemistry, pharmacology, toxicity, and clinical study documented anti-fatigue, antidepressant, anti-inflammatory, antioxidant, cardioprotective, and neuroprotective activities in preclinical studies [3][29]. However, these preclinical findings have not been consistently replicated in well-controlled human trials. The gap between animal/in-vitro data and human clinical outcomes is a recurring limitation across rhodiola research.

General Dosing Ranges

Clinical study doses range from 100 mg to 680 mg/day of standardized extract, with most positive studies using 200–680 mg/day. Extracts should be standardized to approximately 3% rosavins and 1% salidroside.

Dosing by Indication

  • Mild to moderate depression: 340–680 mg/day (up to 1,360 mg/day in non-responders); SHR-5 extract (3.07% rosavin, 1.95% rhodioloside); 6–12 weeks studied [7][8]
  • Anxiety (preliminary): 340–400 mg/day; WS 1375 or Rhodax extract; 2–10 weeks studied [13][9]
  • Mental fatigue (acute, under stress): 100–170 mg/day; SHR-5 extract; 2–3 weeks studied [11][12]
  • Exercise — perceived exertion (acute): 200 mg or 3 mg/kg body weight, single dose taken one hour pre-exercise; 3% rosavin, 1% salidroside [21][22][23]
  • Exercise — resistance recovery: 1,500 mg/day for 4 days showed no benefit [24]

Timing and Administration

Clinical studies have not definitively determined whether R. rosea is best taken with food or on an empty stomach, or at a particular time of day [1]. However, practical patterns from the research include:

  • Daily doses of 400 mg or more are typically divided into two equal parts taken at different times during the day [1].
  • For exercise performance studies, acute doses were taken approximately one hour before exercise [22][23].
  • For anxiety studies, doses were split between morning and midday (e.g., 200 mg taken 30 minutes before breakfast and 200 mg taken 30 minutes before lunch) [13].
  • For depression studies, the full daily dose was sometimes taken as a single dose (340 mg once daily) with titration upward as needed [8].

Important Considerations

  • Most positive clinical evidence comes from doses between 200 mg and 680 mg/day of standardized extracts containing approximately 3% rosavins and 1% salidroside.
  • The extract used in the most rigorous studies (SHR-5) is not currently available in the U.S., though other extracts with similar standardization are commercially available [1].
  • Higher doses do not necessarily produce better results. In the depression study by Darbinyan et al. (2007), both 340 mg and 680 mg improved depression symptoms, though 680 mg additionally improved self-esteem [7].
  • One study using powdered root extract (not a concentrated standardized extract) at 364–546 mg/day actually worsened fatigue compared to placebo [10], suggesting that extract concentration and form matter significantly.
  • For exercise, very high doses (1,500 mg/day for 4 days) showed no benefit for resistance exercise recovery [24], while lower acute doses showed modest effects on perceived exertion [22][23].

Safety and Side Effects

General Safety Profile

Rhodiola rosea is generally well tolerated in clinical studies conducted to date [1][3]. The NCCIH states that rhodiola is "possibly safe for up to 12 weeks" [3]. In the NIH-funded comparison trial (Mao et al., 2015), adverse events were reported by only 30.0% of rhodiola users compared to 63.2% of sertraline users and 16.7% of placebo users [8] — a notable finding, though it does not imply safety has been fully established.

Reported Side Effects

The following adverse effects have been documented in clinical studies:

  • Dizziness: Occasional [9][12][3]
  • Headache: Occasional [9][10][3]
  • Dry mouth: Occasional [9][3]
  • Excessive saliva production: Rare [3]
  • Nausea: Occasional [9][10]
  • Diarrhea: Occasional [10]
  • Insomnia: Occasional [3]
  • Dark stool: Rare (1 case) [10]
  • Blurred vision: Rare (1 case) [10]

Blood Pressure Effects

Some preliminary research suggests R. rosea could potentially lower blood pressure [30]. The herb should be used with caution in people with low blood pressure (hypotension) and those taking medications to lower blood pressure, as rhodiola may enhance the hypotensive effect of these drugs [30]. The NCCIH specifically notes that interactions between rhodiola and losartan (an antihypertensive drug) have been reported [3].

Blood Sugar Effects

Preliminary research suggests R. rosea may lower blood sugar levels [30][31]. It should be used with caution in people with diabetes who are on blood-sugar-lowering medications, as rhodiola may enhance hypoglycemic effects, and in people with hypoglycemia [30][31].

Pregnancy and Breastfeeding

Safety in women who are pregnant or nursing has not been established [1][3]. The NCCIH states that "little is known about whether it's safe to use rhodiola during pregnancy or while breastfeeding" [3]. Until adequate safety data is available, rhodiola should be avoided during pregnancy and lactation.

Duration of Use

Most clinical trials have lasted 2–12 weeks. Long-term safety data beyond 12 weeks is limited [3]. Individuals planning to use rhodiola for extended periods should consult a healthcare provider, as the safety profile is based primarily on short-term use.

Drug Interactions

Antidepressants

SSRIs and other antidepressants: There is one published case report of significant tachycardia (increased heart rate) when R. rosea was taken in combination with the SSRI escitalopram (Lexapro) [32]. Use caution with any prescription antidepressant or other supplements promoted for depression, and consult a physician before combining [1].

MAO Inhibitors: In-vitro studies suggest R. rosea may inhibit monoamine oxidase (MAO) activity [16][17], though this effect was NOT observed when the extract was given orally in an animal study [18], and no human studies exist on this interaction. Until more is known, anyone taking MAO inhibitor drugs for depression — including phenelzine sulfate (Nardil) and tranylcypromine sulfate (Parnate) — should only take R. rosea under physician supervision [1].

Sertraline combination: The Gao et al. (2020) study examined rhodiola combined with sertraline [14], suggesting potential adjunctive effects. However, given the case report of tachycardia with escitalopram [32], any combination of rhodiola with antidepressants should be monitored by a healthcare provider.

Antihypertensive Medications

Rhodiola may enhance the blood-pressure-lowering effect of antihypertensive drugs. The NCCIH specifically notes reported interactions with losartan (Cozaar) [3][30]. Other antihypertensive classes (ACE inhibitors, calcium channel blockers, beta-blockers) have not been specifically studied with rhodiola, but caution is warranted given the potential hypotensive effect.

Blood Sugar-Lowering Medications

Due to preliminary evidence of blood-sugar-lowering effects, rhodiola may theoretically enhance the effects of diabetes medications, including insulin, metformin, sulfonylureas, and other hypoglycemic agents [30][31]. Blood glucose should be monitored carefully if combining rhodiola with these medications.

Other Potential Interactions

Given rhodiola's proposed effects on neurotransmitter systems (serotonin, norepinephrine, dopamine) and the HPA axis [15], theoretical interactions exist with sedatives and anxiolytics (benzodiazepines or other CNS depressants), stimulant medications, and potentially immunosuppressants, given preclinical evidence of immunomodulatory effects [29]. These theoretical interactions have not been confirmed in human studies but warrant caution.

The NCCIH emphasizes: "If you take any type of medicine, talk with your health care provider before using any herbal product; some herbs and medicines interact in harmful ways" [3]. This is particularly important given that rhodiola's drug interaction profile has not been systematically studied.

Dietary Sources

Rhodiola rosea is not a dietary nutrient and is not found in foods consumed as part of a normal diet. It is exclusively consumed as a supplement derived from the root and rhizome of the R. rosea plant. The active compounds (rosavins and salidroside) are plant-specific phytochemicals not present in the general food supply.

Traditional Preparations

Traditionally, rhodiola root was consumed as a tea or decoction in Russia and Scandinavian countries, where it has a centuries-long history of folk use for increasing endurance and reducing fatigue [3][29]. It has also been used in traditional Chinese and Tibetan medicine.

Modern Supplement Forms

Today, rhodiola is available commercially in several forms:

  • Capsules and tablets: The most common supplemental form and the form used in most clinical trials. Typically contain standardized root extract in doses of 170–500 mg per capsule.
  • Tinctures and liquid extracts: Alcohol-based extracts. Less commonly studied in clinical trials, making dosing comparisons with the research literature difficult.
  • Powdered root: Ground dried root, sometimes encapsulated or added to teas and smoothies. Less concentrated than standardized extracts and the only form that showed worsening outcomes in a clinical trial [10].
  • Combination products: Sometimes combined with other adaptogens such as ashwagandha, ginseng, or eleuthero (Siberian ginseng). These combination products have not been studied as rigorously as single-ingredient rhodiola supplements.

Since rhodiola is not an essential nutrient with a dietary requirement, there is no RDA (Recommended Dietary Allowance), adequate intake level, or daily value established for it. Dosing is based entirely on clinical trial data with specific supplement preparations (see Recommended Dosing section above).

References

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  3. National Center for Complementary and Integrative Health (NCCIH). "Rhodiola." Updated April 2025. https://www.nccih.nih.gov/health/rhodiola
  4. Lopresti AL, Smith SJ, Drummond PD. "Modulation of the hypothalamic-pituitary-adrenal (HPA) axis by plants and phytonutrients: a systematic review of human trials." Nutr Neurosci. 2022;25(8):1704-1730.
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  11. Darbinyan V, Kteyan A, Panossian A, et al. "Rhodiola rosea in stress induced fatigue — a double blind cross-over study of a standardized extract SHR-5 with a repeated low-dose regimen on the mental performance of healthy physicians during night duty." Phytomedicine. 2000;7(5):365-371. https://pubmed.ncbi.nlm.nih.gov/11081987/
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  14. Gao L, Wu C, Liao Y, et al. "Antidepressants effects of rhodiola capsule combined with sertraline for major depressive disorder: a randomized double-blind placebo-controlled clinical trial." J Affect Disord. 2020;265:99-103.
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