Ashwagandha, rhodiola, reishi — separating the tradition, the evidence and the marketing.
'Adaptogen' is a mid-century term for plants said to help the body resist stress. Some have genuinely interesting trial data; others coast on the category name.
Ashwagandha has the most human trials for perceived stress and sleep quality, generally at 300-600mg of root extract. Rhodiola shows modest results for fatigue. Reishi's evidence is thinner than the marketing suggests.
Herbs interact with medication. Anything you take daily deserves a conversation with a clinician, especially with thyroid, sedative or immune-modulating drugs.
Key takeaways
- Evidence quality varies enormously between herbs.
- Dose and extract type matter more than brand.
- Check interactions before daily use.
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