Rhodiola Rosea
Small SHR-5 extract trials found less mental fatigue: a 2003 RCT in 161 military cadets after a single dose, a 2000 crossover trial in 56 physicians on night duty over two weeks (Darbinyan et al.), and a 2000 pilot in students during exams. The Swedish burnout RCT (Olsson et al., 2008, n=60, 576mg/day) ran 28 days — not 12 weeks — and improved burnout and attention scores versus placebo, while depression scores improved equally in both groups. A 2012 systematic review of 11 trials rated every included study at high or unclear risk of bias and called the evidence contradictory.
Evidence reviewed:
Mechanism of action
Rhodiola is an adaptogen that modulates the HPA (hypothalamic-pituitary-adrenal) axis, reducing cortisol output under stress. Its key bioactives (rosavins and salidroside) inhibit monoamine oxidase enzymes, increasing availability of dopamine, serotonin, and norepinephrine — neurotransmitters involved in motivation, mood, and cognitive stamina.
Clinical evidence summary
Small SHR-5 extract trials found less mental fatigue: a 2003 RCT in 161 military cadets after a single dose, a 2000 crossover trial in 56 physicians on night duty over two weeks (Darbinyan et al.), and a 2000 pilot in students during exams. The Swedish burnout RCT (Olsson et al., 2008, n=60, 576mg/day) ran 28 days — not 12 weeks — and improved burnout and attention scores versus placebo, while depression scores improved equally in both groups. A 2012 systematic review of 11 trials rated every included study at high or unclear risk of bias and called the evidence contradictory.
Human effect matrix
Based on human clinical trials only. Animal and in-vitro data excluded.
| Effect | Evidence | Magnitude | Studies |
|---|---|---|---|
| Mental Fatigue Reduction | mixed | Moderate | 4 |
| Stress Resilience | preliminary | Small | 2 |
| Physical Endurance | mixed | Small | 2 |
| Mood | mixed | Negligible | 1 |
Evidence key: Strong = multiple consistent RCTs · Moderate = smaller/fewer RCTs · Preliminary = early trials or small n · Mixed = conflicting results
Documented benefits
- Mental fatigue reduction (small, low-quality trials)
- Burnout and attention scores in stress-related fatigue (one 28-day RCT)
Side effects & cautions
- Generally safe; no side effects were reported in the night-duty physician trial
- Mild activation/restlessness initially
- MAO inhibitors and antidepressants: theoretical interaction based on laboratory MAO inhibition, no clinical reports found — ask your doctor before combining
- Avoid late evening dosing
How to take
Stacking recommendations
Ingredients that pair well with Rhodiola Rosea and why.
The classic adaptogen stack. Rhodiola is activating (raises norepinephrine, best morning); Ashwagandha is calming (lowers cortisol, best evening). Together they provide full-day HPA axis support without one cancelling the other out.
Rhodiola's activating effect pairs well with L-Theanine's calming effect. Use Rhodiola for cognitive stamina; L-Theanine to soften any agitation or restlessness Rhodiola can cause initially.
Both target performance under stress via different mechanisms. Rhodiola modulates cortisol/monoamine levels; Tyrosine replenishes catecholamine substrate. Strong combination for high-demand cognitive days or night shifts.
Frequently asked questions
Does Rhodiola need to be cycled?
Not on current evidence. The clinical trials ran from a single dose up to 4 weeks, so they neither tested cycling nor months of continuous use. Some people take a 1–2 week break every 4–6 weeks as a precaution against a possible "ceiling effect".
What do rosavins and salidroside mean on a Rhodiola label?
Rosavins and salidroside are Rhodiola's key bioactives. Rhodiola rosea naturally contains rosavins and salidrosides in about a 3:1 ratio, and preparations are made to reflect it (Ishaque 2012). The trials we cite used the SHR-5 extract, and their abstracts state no marker percentages.
Can Rhodiola cause anxiety or jitteriness?
In a minority of people, especially at doses above 400mg, Rhodiola can cause a stimulant-like restlessness or mild anxiety — particularly in the first week. Start at 200mg and increase gradually. Some people pair it with L-Theanine to soften this, though that combination has not been tested in a trial.
Is Rhodiola safe to take with antidepressants?
Not without medical supervision. Rhodiola compounds inhibit monoamine oxidase in laboratory studies, so an interaction with SSRIs, MAOIs and other antidepressants (including serotonin syndrome) is theoretically possible — no clinical reports were found in our 2026 PubMed review. Always consult your doctor if you are on any psychiatric medication.
Top stacks containing Rhodiola Rosea
Rhodiola Rosea in Japan
Products in Japan
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Regulatory note
本ページは教育目的の編集コンテンツであり、医学的助言を構成するものではありません。日本国内で販売される機能性表示食品（FFC）および特定保健用食品（FOSHU）は、消費者庁への届出または許可を必要とします。届出のない輸入品については、日本の薬機法（旧薬事法）の下で疾病治療を示唆する表現は規制されます。サプリメントを開始する前に、必ず資格のある医療専門家にご相談ください。This page is editorial and not medical advice. Foods with Function Claims (FFC) and Foods for Specified Health Uses (FOSHU) sold in Japan require notification or approval from the Consumer Affairs Agency. Imported products without notification cannot make disease-treatment claims under the Pharmaceuticals and Medical Devices (PMD) Act. Consult a qualified healthcare professional before starting any supplement.
Sources (5)expand
- PMID 22643043Rhodiola rosea for physical and mental fatigue: a systematic review. (2012)
- PMID 12725561A randomized trial of two different doses of a SHR-5 Rhodiola rosea extract versus placebo and control of capacity for mental work. (2003)
- PMID 11081987Rhodiola 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. (2000)
- PMID 19016404A randomised, double-blind, placebo-controlled, parallel-group study of the standardised extract SHR-5 of the roots of Rhodiola rosea in the treatment of subjects with stress-related fatigue. (2008)
- PMID 10839209A double-blind, placebo-controlled pilot study of the stimulating and adaptogenic effect of Rhodiola rosea SHR-5 extract on the fatigue of students caused by stress during an examination period with a repeated low-dose regimen. (2000)