Cases of liver injury have been reported. It may raise thyroid hormone levels, and experts advise against it in pregnancy. It can interact with diabetes, blood pressure, thyroid, sedative and immune-suppressing medicines. Denmark banned it in 2023.

Ashwagandha: what it is and how much people take

Ashwagandha is an evergreen shrub whose root is used in supplements. Studies have looked at stress, anxiety and sleep, with extracts and amounts that vary widely. Studies have usually used 240 to 600 milligrams a day of extract. Cases of liver injury have been reported.

Checked 28 September 2026 · Source: NIH Office of Dietary Supplements fact sheet · Adults only

General information, not medical advice. Check with a doctor or pharmacist before taking a supplement, especially if you are pregnant or breastfeeding, take any medicine, or are under 18.

How much people take

What studies looked at	Studies have looked at stress, anxiety and sleep, with extracts and amounts that vary widely.
Amounts studies used	240 to 600 milligrams a day of extract.
Official upper limit	None set

Cautions and interactions

Cases of liver injury have been reported.
It may raise thyroid hormone levels, and experts advise against it in pregnancy.
It can interact with diabetes, blood pressure, thyroid, sedative and immune-suppressing medicines. Denmark banned it in 2023.

Dose questions

Is 600 mg of ashwagandha too much?

Quick answers

What is ashwagandha?: Ashwagandha is an evergreen shrub whose root is used in supplements.
What has ashwagandha been studied for?: Studies have looked at stress, anxiety and sleep, with extracts and amounts that vary widely.
How much ashwagandha do studies use?: 240 to 600 milligrams a day of extract.
Is ashwagandha safe?: Cases of liver injury have been reported. It may raise thyroid hormone levels, and experts advise against it in pregnancy. It can interact with diabetes, blood pressure, thyroid, sedative and immune-suppressing medicines. Denmark banned it in 2023.

Sources

NIH Office of Dietary Supplements fact sheet
https://ods.od.nih.gov/factsheets/Ashwagandha-HealthProfessional/

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