Adaptogens: Frequently Asked Questions

This page answers the questions people ask most about adaptogens, using what NIH, medical bodies and published reviews say. It is information, not medical advice. Each answer points to a longer guide.

What are adaptogens?

The word usually means plants (and, in marketing, some mushrooms) that are thought to help the body resist stress. NIH describes adaptogenic herbs this way. [1] It is a contested term: it comes from Soviet-era research, and the European Medicines Agency herbal committee says it is not accepted in pharmacological and clinical terminology commonly used in the EU. [2] See What are adaptogens?.

Do adaptogens work?

It depends on the ingredient, the preparation and the outcome, so there is no single answer.

• Ashwagandha: NIH says some preparations may be effective for insomnia and stress, and evidence for anxiety is unclear. [3]
• Rhodiola: NIH says there is not enough reliable evidence to say it is useful for any health-related purpose. [4]
• Asian ginseng: NIH says most trials were small and shorter than 3 months. [1]
• Astragalus: NIH says there is not sufficient reliable evidence for any health condition. [5]

A result for one extract or species does not transfer to another. See research and evidence and the ingredient table.

Are adaptogens safe?

"Natural" does not mean safe, and the answer differs by plant. Examples from the sources:

• Ashwagandha: liver injury cases are rare but have been reported, and NIH says to avoid it in pregnancy and while breastfeeding. [3]
• Asian ginseng: insomnia is the most common side effect, and it may interfere with blood clotting and lower blood sugar. [1]
• Licorice root: glycyrrhizin can cause serious effects such as irregular heartbeat, especially in large amounts or over the long term. [6]

Not finding a caution in a source is not proof of safety. See adaptogen safety and the quick reference for warning signs.

Can adaptogens interact with my medicines?

Yes, for some of them. NIH says ashwagandha might interact with medicines for diabetes and high blood pressure, immunosuppressants, sedatives, anti-seizure medicines and thyroid hormone medicines. [3] NIH reports a rhodiola interaction with losartan. [4] Memorial Sloan Kettering says to talk with a provider if taking warfarin and using American ginseng. [7] Do not stop or change a prescribed medicine yourself. Ask the prescriber or a pharmacist. See how interactions work.

Do adaptogens lower cortisol or heal "adrenal fatigue"?

We cannot say that. Cortisol is a lab marker that helps the body respond to stress, and a changed marker is not the same as a changed outcome. [8] The Endocrine Society says no scientific proof exists to support adrenal fatigue as a true medical condition, and that tiredness may come from adrenal insufficiency, depression, sleep apnea or other problems that need a real diagnosis. [9] See adrenal fatigue claims.

Are adaptogens the same as stimulants like caffeine?

In the old Soviet-era definition they were not supposed to be: the EMA paper says adaptogens were reputed to cause increased work capacity not followed by a decrease, unlike stimulants. [2] In practice, NIH lists insomnia as the most common side effect of Asian ginseng. [1]

What is the difference between a supplement and a medicine?

NIH says dietary supplements are not approved by the FDA before they are sold, and that manufacturers are responsible for safety and labeling. [3] Products you buy may differ in important ways from products tested in studies. [10] See supplement quality testing.

Are mushrooms like reishi and cordyceps adaptogens?

Some are marketed that way. The guides, evidence and safety notes are in the Mushrooms section: reishi and cordyceps.

Which adaptogen is best?

Proper evidence not found for a "best" one. We looked at NIH pages, Memorial Sloan Kettering pages and PubMed review abstracts, and none ranks adaptogens head to head. The comparison index answers one question at a time without declaring winners.

What should I tell my doctor before surgery?

NIH says to talk to your providers as far ahead of an operation as possible and tell them about all supplements you take. [10] For ashwagandha, NIH says it is not recommended for people about to have surgery. [3]

Where should I start reading?

For a plain overview, What are adaptogens?. For terms, the glossary. For stress itself, the Wellness section has stress and relaxation guidance. If stress or low mood is affecting daily life, a clinician can help.