What are the side effects of Rhodiola Rosea?

Occasional overstimulation or jitteriness at higher doses Sleep disruption if taken late

Who should avoid Rhodiola Rosea?

Bipolar spectrum conditions without clinician guidance Pregnant or breastfeeding without review

Adaptogen

Rhodiola Rosea

An adaptogenic herb standardized for rosavins and salidroside. Its studied benefit is narrow: reducing stress-related mental fatigue and helping sustain output during genuinely demanding stretches (night shifts, exam load), not lifting baseline performance in a rested, unstressed adult.

Grade CSignal State Core candidateUpdated September 17, 2026Written and fact-checked in-house against The Evidence Standard. Not a clinical review.

Please note

Educational content, not medical advice. Doses below are ranges used in research, not recommendations. Talk to a qualified clinician before starting any supplement, especially if you take medication, are pregnant, or manage a health condition.

Evidence grade: Evidence: Grade C
Studied dose range: 100–170 mg daily of the SHR-5 standardized extract in the trials cited here; the wider literature spans roughly 100–600 mg daily.
Time to effect: Some acute-fatigue studies; often used daily.
Best form: Extract standardized to rosavins and salidroside.

The short answer

Rhodiola Rosea (Adaptogen) is studied for stress-related fatigue under sustained pressure (night shifts, exam-type load) and sustained output when already under stress or fatigue. In our conservative reading of the published human research, the evidence is Grade C (limited). 100–170 mg daily of the SHR-5 standardized extract in the trials cited here; the wider literature spans roughly 100–600 mg daily. Some acute-fatigue studies; often used daily. A studied dose is what trials used, not a recommended dose.

Full profile

Also known as	Golden root, Arctic root
Best for	Stress-related fatigue under sustained pressure (night shifts, exam-type load) · Sustained output when already under stress or fatigue
Evidence grade	Grade C · Limited: early or small human trials
Studied dose range	100–170 mg daily of the SHR-5 standardized extract in the trials cited here; the wider literature spans roughly 100–600 mg daily.
Time to effect	Some acute-fatigue studies; often used daily.
Best form	Extract standardized to rosavins and salidroside.

Evidence, honestly graded

Real but under-replicated. The two founding trials (Darbinyan 2000; Spasov 2000) are small and sponsor-clustered (both run through the Swedish Herbal Institute), and a 2012 systematic review (Ishaque et al.) flagged high risk of bias across the Rhodiola literature and a lack of independent replication. Under a replication-over-recency standard, that trial base is a C, not a B, even though the direction of effect is consistent. Graded for the specific claim it's actually tied to (stress-related fatigue and sustained output under load), not as a general-purpose baseline enhancer, which the evidence does not support. Reviewed 2026-09-17: a 2025 crossover trial in 27 resistance-trained adults (Koozehchian et al.) reported better Stroop performance, but the cognitive comparisons are reported against a no-capsule condition rather than against the placebo, so they are not blinded comparisons and do not lift the grade.

See the full grading rubric (study type, replication, population match, and dose adequacy) in The Evidence Standard.

What the benefits research does and doesn't support, in depth: Rhodiola Rosea: Benefits, Dosage, and What to Look For.

1,121 natural health products with an active licence in Health Canada's LNHPD list Rhodiola Rosea as a medicinal ingredient.

That makes Rhodiola Rosea a recognized, licensable medicinal ingredient in Canada, regulated by Health Canada's Natural and Non-prescription Health Products Directorate, which issues each licensed natural health product a Natural Product Number (NPN). Search the LNHPD to verify.

Source: Health Canada Licensed Natural Health Products Database, snapshot 2026-09-28. A count of products with an active licence, not an endorsement of any health claim. This describes the ingredient's regulatory standing in Canada, not Signal State Core, which is a pre-launch concept and is not a licensed natural health product.

Side effects

Occasional overstimulation or jitteriness at higher doses
Sleep disruption if taken late

Who should avoid it or check first

Bipolar spectrum conditions without clinician guidance
Pregnant or breastfeeding without review

Interactions

May interact with antidepressants and stimulant medications; discuss with a clinician

Stacks well with

L-Theanine

Use caution stacking with

Other strongly stimulating adaptogens without a clear rationale

What to look for on a label

Look for the rosavin and salidroside standardization.
Take earlier in the day to avoid sleep disruption.
Prefer products with identity testing that confirms Rhodiola rosea specifically: in a UK market survey (Booker 2016), some products contained no rosavins at all, pointing to other Rhodiola species, and most of the rest held less rosavin than registered products.

References

Koozehchian MS, Newton AT, Mabrey G, et al. (2025). Nutrients, 17(23):3736Randomized, double-blind, placebo-controlled crossover with an additional no-capsule condition, 27 resistance-trained adults, 7 days per conditionStudied dose: Low and high doses of a golden-root extractStroop word, colour and colour-word scores improved against the no-capsule condition; the placebo contrast is reported for the strength outcomes rather than for the Stroop.
Darbinyan V, Kteyan A, Panossian A, et al. (2000). Phytomedicine, 7(5):365–371Randomized, double-blind, placebo-controlled crossover, n=56 physicians on night duty, 2 weeksStudied dose: 170 mg daily (SHR-5 extract)Reduced mental-fatigue measures during stressful night shifts versus placebo.
Spasov AA, Wikman GK, Mandrikov VB, et al. (2000). Phytomedicine, 7(2):85–89Randomized, double-blind, placebo-controlled, students during exams, 20 daysStudied dose: 100 mg daily (SHR-5 extract)Improved self-reported mental fatigue and well-being versus placebo.
Ishaque S, Shamseer L, Bukutu C, Vohra S (2012). BMC Complementary and Alternative Medicine, 12:70Systematic review, 11 human RCTsRhodiola trials showed a consistent direction of benefit for stress-related fatigue but were generally small, heterogeneous, and methodologically weak.
Booker 2016, Phytomedicine: authenticity and quality of Rhodiola rosea products. Of 39 commercial products tested, 5 contained no rosavins (suggesting substitution with other Rhodiola species) and about 80% of the remainder contained less rosavin than registered products. PMID 26626192. Sourcing and quality background, not an efficacy finding.

Grades and studied doses are our conservative reading of the human research, shown for education. They are not product claims, and a studied dose is not a recommended dose.

Revision history

Every change to this ingredient's evidence status, dated and explained. The full cross-library log lives at Evidence Updates.

2026-09-17Citation review
Added the newest cognitive data and the reason it does not move the grade: a 2025 crossover trial in 27 resistance-trained adults reports better Stroop performance against a no-capsule condition rather than against its own placebo, so the cognitive comparison is not blinded. C holds.
2026-09-14Citation review
Grade unchanged at C. Added product-authenticity evidence: a UK market survey found some Rhodiola products contained no rosavins and most held less than registered products, so identity testing now appears in the label guidance.
2026-07-07Grade changeGrade B → Grade C
Downgraded from B to C. The human trials are mostly small, short, and heterogeneous in outcome measure, and several are sponsor-linked — not enough consistent, independent replication to hold a B.

See how Rhodiola Rosea compares on grade, dose, and goal in the Evidence Explorer.

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