Supplement: Rhodiola

What It Is

Rhodiola rosea is a hardy plant that grows in cold, high places across the Arctic and the mountains of Europe and Asia, and the root and rhizome are the parts used. It belongs to the group of herbs called adaptogens, plants said to help the body cope with stress, and people take it mainly to feel less tired and less stressed. That is where the human evidence is strongest, and strongest here still means small, short trials of a few standardized extracts. Modern supplements use a root extract standardized to two marker compounds, rosavins and salidroside, in roughly the ratio the trials used.

Rhodiola has a long empirical record behind its modern use. In Scandinavia and across Siberia it was a folk remedy for fatigue, cold, and hard physical work, and Carl Linnaeus documented its use in eighteenth-century Sweden. From the 1940s onward, Soviet and Scandinavian scientists studied it for decades as an adaptogen, testing it in athletes, soldiers, students, and cosmonauts as a plant to sustain performance and recovery under strain, work that was treated at times as a state secret. Much of that research appeared in Russian and sits outside the modern controlled-trial literature. That research is a long record of practical use, which the later trials then tested. Panossian and colleagues' 2010 review gathers this traditional and Soviet-era record alongside the modern pharmacology.

How It Works

Rhodiola's extract carries many active compounds at once, chiefly rosavins and salidroside, so it works as a whole-plant preparation acting on several systems, and no single molecule accounts for its effects. The best-mapped effect is on the body's response to stress, and the anti-fatigue benefit looks like rhodiola dampening that response under load, which is why its clearest effects show up in people who are already depleted and fade in people who are rested. These mechanisms are plausible and partly measured; none is settled.

Anatomy of the Practice

1A root, standardized to two markers

The studied preparation is a concentrated root and rhizome extract, usually standardized to about 3% rosavins and 1% salidroside, the ratio used in the trials. Products vary in how they are made and what they contain, which is one reason a result shown for one extract does not automatically carry to another.

2On the stress response

In the strongest fatigue trial, rhodiola blunted the surge of the stress hormone cortisol that normally follows waking. That is the mechanism researchers tie most directly to its effect on how tired and stressed people feel.

3Activating, and why timing matters

Rhodiola is activating, which fits its use for fatigue and low energy and its history as a stimulant. That activating quality is why the dose is taken earlier in the day, and why a few people find it too stimulating.

What It Does

Rhodiola's findings fall into a clear order of strength. Fatigue and stress sit at the top: this is the use with the most controlled support and the longest folk and Soviet-era record behind it, and the two lines of evidence agree. Mood comes next, backed by a handful of small placebo-controlled trials, among them an 89-person depression trial and a smaller 57-person comparison against sertraline. Raw physical performance and thinking in already-rested people sit lowest, where a single dose does little and daily dosing does nothing. The findings below are graded on that basis.

One caveat shapes how much weight each finding carries. Almost every human trial of rhodiola shares the same limits:

• It is small, from a few dozen to about a hundred people.
• It is short, running from a single dose to twelve weeks, with nothing measured beyond that.
• It tests one of only a few standardized extracts, so a result for one product may not carry to another.
• It comes from a few research groups, several tied to the extract makers, with little independent replication.

Two independent systematic reviews that pooled these trials reached the same verdict: the studies are mixed in quality and at high or unclear risk of bias, and a rigorous, well-reported randomized trial is still needed. That does not make the results wrong, and the fatigue and stress trials tend to agree. It means the effects read as early and specific to the extracts and doses studied.

Rhodiola's clearest use is a defined few-week trial for fatigue and stress, judged against how you feel. A diagnosed mood condition is a decision to make with a clinician.

The Research & Studies

Everything here is based on the research we have collected and checked, sorted into groups and ordered with the strongest evidence first. Click any claim to open the studies behind it.

Energy And Fatigue

Less mental fatigue under stress in two small placebo-controlled trialsEmerging

In plain terms

In two small trials run during high-stress weeks, an exam period and hospital night shifts, people who took a standardized rhodiola extract felt and performed as less mentally tired than people on a placebo.

In detail

Darbinyan 2000 gave 56 young healthy physicians a standardized SHR-5 extract or placebo in a double-blind crossover during two-week night-duty blocks, and found a statistically significant improvement in a fatigue index built from tests of associative thinking, short-term memory, calculation, concentration and audio-visual perception during the first two weeks. Spasov 2000 randomized foreign students to SHR-5 or placebo across a 20-day exam period and found the clearest gains in physical fitness, mental fatigue and neuro-motor tests (P<0.01) with better general well-being (P<0.05), while text-correction and tapping tests did not separate, and the authors judged the dose probably suboptimal. Both are small, short, and test one extract, so the signal is early rather than settled.

The studies · 2

Darbinyan 2000, Phytomedicine · Phytomedicine

Spasov 2000, Phytomedicine · Phytomedicine

Anxiety And Stress

Less burnout than placebo over 28 days in 60 adults with stress-related fatigueEmerging

In plain terms

In the strongest controlled trial, adults diagnosed with stress-related fatigue improved more on rhodiola than on placebo over four weeks: less burnout, sharper concentration, and a smaller morning stress-hormone spike.

In detail

Olsson 2009 was a phase III randomized, double-blind, placebo-controlled parallel-group trial in 60 men and women aged 20 to 55 who met the Swedish national criteria for fatigue syndrome. Both groups improved (a placebo effect was present), but when compared directly, SHR-5 (576 mg extract/day for 28 days) beat placebo on the Pines burnout scale and on continuous-performance attention indices (omissions, reaction-time variability), and pre- to post-treatment cortisol awakening responses differed significantly in the treatment group. This is one small, short, single-extract trial, and the burnout scale is a self-report measure.

The study · 1

Olsson 2009, Planta Med · Planta Med

Burnout and life-stress symptoms improved in three open-label trials with no placebo groupPreliminary

In plain terms

In three studies where everyone knew they were taking rhodiola and there was no placebo group, people with burnout, life stress, or long-running fatigue reported feeling better over the following weeks.

In detail

Kasper 2017 (118 burnout outpatients, 400 mg/day WS 1375 for 12 weeks), Edwards 2012 (101 life-stress patients, 200 mg twice daily for 4 weeks) and Lekomtseva 2017 (100 patients with prolonged or chronic fatigue, 200 mg twice daily for 8 weeks) were all open-label single-arm trials: no control group, no blinding, and the authors describe them as exploratory hypothesis-generating pilots. Symptom scales improved over time, often within the first week. Without a placebo arm these designs cannot separate the extract's effect from expectation and the natural settling of symptoms, which is why they sit below the controlled trials.

The studies · 3

Kasper 2017, Neuropsychiatr Dis Treat · Neuropsychiatr Dis Treat

Edwards 2012, Phytother Res · Phytother Res

Lekomtseva 2017, Complement Med Res · Complement Med Res

Mood & stress

Less anxiety and low mood over 14 days versus a no-treatment controlEmerging

In plain terms

Mildly anxious adults who took rhodiola for two weeks reported less anxiety, stress and low mood than a group who took nothing.

In detail

Cropley 2015 randomized 80 mildly anxious participants to a rhodiola extract (2 x 200 mg/day) or a no-treatment control over 14 days. The rhodiola group showed significant reductions in self-reported anxiety, stress, anger, confusion and depression and improved total mood, with a favorable tolerability profile. The key limit is the design: the control group received no treatment rather than a placebo, and the study was not blinded, so expectation is not controlled for. The authors argue the gradual, symptom-specific pattern makes a pure placebo effect less likely, but they state they cannot establish a causal relationship.

The study · 1

Cropley 2015, Phytother Res · Phytother Res

Counts once: this finding and 1 other here come from the same source, so they are one body of evidence, not separate confirmations.

Depression scores fell 5.1 on rhodiola, 8.2 on sertraline, 4.6 on placebo, with no reliable differenceEmerging · mixed

In plain terms

In one small head-to-head trial, rhodiola landed between the antidepressant sertraline and placebo for depression, but the trial was too small for any of those differences to be reliable.

In detail

Mao 2015 was a phase II randomized, placebo-controlled proof-of-concept trial: 57 adults with mild-to-moderate major depressive disorder were assigned to standardized rhodiola extract, sertraline, or placebo for 12 weeks. Reductions in Hamilton Depression scores were modest and did not differ significantly between groups (p=0.79); the point estimates were largest for sertraline (-8.2, 95% CI -12.7 to -3.6), intermediate for rhodiola (-5.1, 95% CI -8.8 to -1.3) and smallest for placebo (-4.6). The trial was explicitly underpowered to prove efficacy; its clearer finding is on tolerability, where rhodiola caused far fewer adverse events than sertraline.

The study · 1

Mao 2015, Phytomedicine · Phytomedicine

Mild-to-moderate depression improved on rhodiola but not placebo in an 89-person, 6-week trialEmerging

In plain terms

In an earlier six-week trial, people with mild-to-moderate depression improved on rhodiola across most symptoms while the placebo group did not.

In detail

Darbinyan 2007 was a randomized, double-blind, placebo-controlled parallel-group trial in 89 men and women aged 18 to 70 with mild-to-moderate depression (Hamilton scores 21 to 31). Two active groups (340 mg/day and 680 mg/day of SHR-5 for 6 weeks) showed significant improvement in overall depression plus insomnia, emotional instability and somatization, whereas the placebo group did not; self-esteem did not improve, and no serious side effects were reported. It is a single small trial from one research group, and it has not been independently replicated at this size.

The study · 1

Darbinyan 2007, Nord J Psychiatry · Nord J Psychiatry

Cardiorespiratory Fitness

A single dose nudged endurance from 16.8 to 17.2 minutes; daily dosing did nothingEmerging

In plain terms

Taken as a single dose an hour before exercise, rhodiola gave a small bump in endurance, mostly by making the effort feel easier. Taking it daily for four weeks did nothing extra.

In detail

De Bock 2004 (n=24, double-blind placebo crossover) found that an acute 200 mg dose lifted time to exhaustion from 16.8 to 17.2 minutes and raised peak oxygen uptake, but a four-week daily-intake phase produced no change in any measure. Noreen 2013 (n=18, double-blind crossover) found an acute 3 mg/kg dose sped a 6-mile cycling time-trial from 25.8 to 25.4 minutes and lowered ratings of perceived exertion and warm-up heart rate, with no change in most other variables. The effects are small, come from single acute doses in tiny samples, and the one chronic-dosing arm was null.

The studies · 2

De Bock 2004, Int J Sport Nutr Exerc Metab · Int J Sport Nutr Exerc Metab

Noreen 2013, J Strength Cond Res · J Strength Cond Res

Counts once: this finding and 1 other here come from the same source, so they are one body of evidence, not separate confirmations.

Cognition

No sharper thinking, reaction time or attention in already-rested peopleEmerging · no effect

In plain terms

In people who were not exhausted, rhodiola did not sharpen thinking, reaction time or attention beyond what a control group showed.

In detail

The anti-fatigue trials measure performance under stress or sleep loss, where rhodiola shows a signal. When cognition is measured in rested people, the picture is flat: Cropley 2015 found no between-group difference on cognitive tests despite the mood improvement, and the four-week daily-dosing phase of De Bock 2004 found no change in aural or visual reaction time, plate-tapping speed, or sustained attention. The apparent benefit seems tied to counteracting fatigue rather than raising baseline cognitive ability.

The studies · 2

Cropley 2015, Phytother Res · Phytother Res

De Bock 2004, Int J Sport Nutr Exerc Metab · Int J Sport Nutr Exerc Metab

Counts once: this finding and 1 other here come from the same source, so they are one body of evidence, not separate confirmations.

Evidence And Methods

All 11 fatigue trials carried a high or unclear risk of bias, with little independent replicationEmerging · mixed

In plain terms

When reviewers gathered the trials and graded them, they found the studies small, short, and shaky in quality, and rarely repeated by a second independent team. The direction is encouraging; the certainty is not there yet.

In detail

Ishaque 2012 systematically reviewed 11 trials of rhodiola for physical and mental fatigue and concluded that every included study had either a high risk of bias or reporting flaws that made its true validity unclear, that results were contradictory, and that a rigorous well-reported RCT is still needed. Hung 2011 reviewed 11 placebo-controlled RCTs across physical performance, mental performance and mental-health conditions, rated most as moderate or good quality on the Jadad scale, but found a lack of independent replication of any single finding. This describes the state of the evidence base rather than the direction of the effect: the trials tend to point the same way, but their size, independence and risk of bias are the reasons to hold the conclusion loosely.

The studies · 2

Ishaque 2012, BMC Complement Altern Med · BMC Complement Altern Med

Hung 2011, Phytomedicine · Phytomedicine

Getting the Dose and Timing Right

Ways to Do It

The practical protocol is short: a standardized root extract, taken earlier in the day, for a defined stretch of weeks. Read the Cautions section below first, because a few situations make it a poor fit. No brand is named here on purpose; the form, the dose, the timing, and a full trial period are what decide whether it works for you.

1

Use a standardized root extract at 200 to 400 mg a day$Easy

The trials used a root and rhizome extract standardized to roughly 3% rosavins and 1% salidroside. Effective daily doses in the studies ranged from about 200 mg up to around 600 mg, with 400 mg a day the most common in the stress and fatigue trials. Because products vary in how they are standardized, an extract that states its rosavin and salidroside content, and carries an independent testing mark, is the sensible choice.

2

Take it in the morning$Easy

Rhodiola is stimulating, and the trials dosed it earlier in the day. Taken late it can be activating enough to disturb sleep in some people. A morning dose, or morning and early afternoon if you split it, keeps the effect where you want it and away from the night.

3

Give it a defined trial of a few weeks, then judge$Easy

Any effect builds over days to weeks, and the trials ran from about four to twelve weeks, so that is the window the evidence covers. Take it across that stretch and judge it against how you felt at the start. If fatigue or stress has not shifted by the end of the window, it is not working for you, and there is no case for continuing. Pair it with the practices that have stronger evidence for the same goals, linked below.

Go Deeper

• Ashwagandha: the other adaptogenic root taken for stress and sleep, with a similar small-trial evidence base and safety signals of its own to read.
• Breath and heart-rate variability: a free, well-evidenced way to act on the same stress response, with no supplement to weigh.
• The CBT-I protocol: the first-line, best-evidenced approach to poor sleep, to try before or alongside anything taken for stress-related sleeplessness.

The Chinese Medicine View

Rhodiola is best known in Tibetan medicine, where the plant, called Hong Jing Tian in Chinese, has a long history of use in the cold high country where it grows. It entered the Chinese materia medica later than the classical staples and is a relatively modern addition, so it does not carry the centuries of commentary that an herb like ginseng does. In this tradition it is used as a medicinal in its own right.

In Chinese medicine terms, Hong Jing Tian is understood to tonify Qi, particularly of the Lung and Heart, to invigorate the Blood and move Blood stasis, and to clear heat from the Lung. Practitioners have used it for Qi deficiency with Blood stasis, for shortness of breath and cough, and for the fatigue and altitude strain of high, cold environments. That framing sits close to the modern use for fatigue and stress: a plant taken when energy and resilience run low. Rhodiola's standing rests on that long record of practical use as much as on the modern trials that point the same way. The Chinese framing offered here connects it to the rest of this library; it is not a claim that the tradition predicted the trial results.

Cautions For This Practice

Extra restraint

Everything to be aware of is here, in one place. This practice suits most healthy people; a few situations call for real care.

Few side effects over weeks, and fewer than sertraline (30% versus 63.2%)

Hung 2011, reviewing 11 placebo-controlled RCTs, reported only a few mild adverse events across the trials. Mao 2015 found adverse events in 30% of the rhodiola group versus 63.2% on sertraline and 16.7% on placebo (p=0.012), and concluded rhodiola was better tolerated. These are reassuring short-term data measured over weeks to a few months; they say nothing about use over many months or years, and the trials are too small to detect uncommon harms.Hung 2011, PhytomedicineMao 2015, Phytomedicine

No trial ran longer than twelve weeks; long-term, pregnancy and breastfeeding use unstudied

The controlled trials of rhodiola run from a single acute dose to about twelve weeks. Ishaque 2012 and Hung 2011 both conclude that the evidence base is too small and too short to support firm conclusions and that rigorous, longer, independently replicated trials are needed. There is no controlled safety data for use beyond a few months, and pregnancy, breastfeeding and interactions with medication have not been formally studied, which is why the practical guidance keeps use to a defined trial period and treats those situations as reasons for care.Ishaque 2012, BMC Complement Altern MedHung 2011, Phytomedicine

It is stimulating, so keep it out of the evening

Rhodiola is activating for most people. Some find it energizing, and some find it too much: jitteriness, restlessness, irritability, or trouble sleeping if it is taken late in the day or at a higher dose. Taking it in the morning, starting at the lower end of the dose range, and easing up if you feel wired keeps it comfortable for most people.

Take care if you have bipolar disorder

Because rhodiola is activating and has an antidepressant-like effect in some trials, there is a reasonable concern that it could tip someone with bipolar disorder toward agitation or a manic or hypomanic state. If you have bipolar disorder or a history of mania, make this decision with the clinician who manages your care.

Pregnancy and breastfeeding: the data is not there

Rhodiola has not been studied in pregnancy or breastfeeding, so there is no basis for judging its safety in those situations. The cautious course is to avoid it while pregnant, trying to conceive, or breastfeeding until there is evidence to rely on.

It may interact with some medications

Given its effects on mood and stimulation, take care combining rhodiola with antidepressants, stimulants, or other mood medication, where the effects could add up. Raise it with your clinician or pharmacist if you take medication with a narrow margin of safety, such as for blood pressure, blood sugar, or blood thinning. When in doubt, check before combining.

Start slow, be smart, read the research, and consult a professional if you have any concerns. This is here to inform your choice, not make it for you.

Common Questions

Does rhodiola actually help with fatigue?

In small short trials, it points that way. The strongest controlled trial, in 60 adults with a stress-related fatigue syndrome, found less burnout and better concentration on a standardized extract than on placebo over four weeks, and two trials during real stress, exams and hospital night shifts, found less mental fatigue. The caution is that these trials are small, brief, and mostly from a few groups, and when reviewers graded the wider literature they found it contradictory and at high or unclear risk of bias. It is an early, promising signal for fatigue and stress that larger trials have yet to confirm.

Is rhodiola a reliable adaptogen that beats stress?

The stress and fatigue results are modest and early. The marketing that presents rhodiola as a dependable stress cure claims far more than the results show. The controlled trials show a short-term effect on stress-related fatigue and mood, and several open-label trials in burnout and life stress report people improving. Without a placebo group those cannot separate the extract's effect from expectation, which strongly shapes how someone feels under stress, so they support the case without settling it. The evidence is still small, short, and thin on independent replication. Give rhodiola a defined trial for stress and fatigue, judged on how you feel.

How much should I take, and when?

The trials used a root extract standardized to about 3% rosavins and 1% salidroside, at roughly 200 to 600 mg a day, with 400 mg a day the most common in the stress and fatigue studies. Take it in the morning, because rhodiola is stimulating and a late dose can disturb sleep. Give it a defined stretch of about four to twelve weeks, the window the evidence covers, and judge it against how you felt at the start.

Can rhodiola help with depression or anxiety?

The evidence is early and should not be oversold. One 89-person trial found people with mild-to-moderate depression improved on rhodiola across most symptoms while the placebo group did not, and a small 57-person head-to-head trial placed rhodiola between the antidepressant sertraline and placebo, though that trial was too small for the differences to be reliable. For anxiety, a two-week trial found lower self-reported anxiety and stress, though its comparison group took nothing instead of a placebo, so part of the change reflects the ordinary lift of taking something and expecting to improve, which matters in its own right. Rhodiola is not a treatment for clinical depression; a mood condition is a good reason to bring a clinician into the decision.

Does rhodiola have side effects?

For most people, over the weeks the trials covered, few. A review of eleven controlled trials found only a few mild adverse events, and in the depression trial far fewer people reported side effects on rhodiola than on sertraline, 30% against 63.2%. The main thing people notice is that it can be too stimulating, especially late in the day or at higher doses. Longer-term use has not been studied, and it has not been studied in pregnancy or breastfeeding, so those and the interactions above are the situations to take seriously. The Cautions section above has the detail.