Rhodiola rosea
Also called: rhodiola, roseroot, golden root, arctic root.
A so-called adaptogenic root, said to help the body adapt to stress, sold for fatigue and stress, more stimulating than calming, whose quality depends on a standardization that many bottles do not have.
What it is
Rhodiola rosea grows in cold regions and at altitude in Europe, Asia and North America. Its root and rhizome are used in Russia and Scandinavia for endurance, fatigue and depression. Its markers are rosavins, specific to the species, and salidroside. People buy it for energy, mental fatigue and resistance to stress.
What the label does not say
- The name on the bottle does not attest to the species. Of about forty European products, roughly one fifth contained no rosavins at all, and about 80% of the others appeared to be cut with other Rhodiola species (2016). Of 10 American products bought in 2024, rosavins ranged from 0.01% to 3.08%, one product declared almost five times more than it actually contained, and another appeared to contain undeclared synthetic salidroside.
- It is a mild stimulant, not a sedative: Health Canada requires the statements "avoid taking before bedtime" and "discontinue use if you experience irritability or insomnia", and the NCCIH lists insomnia among the reported effects. A bottle sold for stress and taken in the evening works against sleep.
- The fatigue trials contradict each other: of 11 studies, 2 of the 6 on physical fatigue and 3 of the 5 on mental fatigue report a benefit, all with a high risk of bias or reporting gaps, at doses of 100 to 680 mg per day and over 2 days to 4 weeks. The NCCIH concludes that the research, of low to moderate quality, does not allow a conclusion for any use.
The forms on the shelf
- Standardized extract: the Canadian monograph accepts 0.8 to 3% salidroside and/or 1 to 6% rosavins, at 144 to 680 mg per day, without exceeding 200 mg per dose. The extract in most trials is dosed at 3% rosavins and 1% salidroside.
- Non-standardized extract: 144 to 400 mg of extract equivalent to 216 to 2,000 mg of dried root. Without a marker assay, the species is not verified.
- Tincture: 1.2 to 1.8 g of dried root per day according to the monograph.
Published reference values
- No recommended intake. Health Canada: 144 to 680 mg of standardized extract per day, at most 200 mg per dose; positive trials on mental fatigue from 100 to 576 mg per day, including 576 mg of the most studied standardized Swedish extract. Examine describes a bell-shaped response where high doses can lose their effect.
- The NCCIH considers it possibly safe for up to 12 weeks; reported effects: dizziness, headaches, insomnia, dry mouth or excessive salivation.
- Canadian contraindication: bipolar disorder or bipolar spectrum disorder. No reliable data in pregnancy or breastfeeding.
When
In the morning or early in the day. The Canadian monograph asks you to avoid taking it before bedtime, and Examine describes it as mildly stimulating, without being a classic stimulant like caffeine.
Keep apart from
- Antidepressants: consult before use (Health Canada); Examine flags possible inhibition of CYP3A4, an enzyme that metabolizes many medications.
- Losartan: interaction reported (NCCIH).
- Hormone replacement therapy and contraceptives: consult before use (Health Canada).
To mention to a professional
- Bipolar disorder, ongoing antidepressant, treated hypertension, pregnancy and breastfeeding, insomnia or irritability appearing during use: check with a health care professional.
What it is sold for, and what the data show
Rhodiola is sold as the adaptogen for energy and stress. The fatigue trials exist, but they contradict each other and all suffer from bias; the effects on cognition appear secondary to the drop in fatigue. And a sizeable share of bottles does not contain the plant used in the trials. The promise outruns the data, especially for non-standardized products.
Sources
- Health Canada, natural health product monograph, Rhodiola (Rhodiola rosea), 2025
- NCCIH, Rhodiola
- Ishaque et al., Rhodiola rosea for physical and mental fatigue: a systematic review, BMC Complementary and Alternative Medicine, 2012
- Booker et al., The authenticity and quality of Rhodiola rosea products, Phytomedicine, 2016
- Porwollik et al., The quality and safety of Rhodiola rosea supplements on the U.S. market, PLoS One, 2026
- Examine.com, Rhodiola rosea
Educational information, drawn from the sources above. It does not replace the advice of a health professional, who remains the reference for your situation, your medications, pregnancy or breastfeeding.