Ashwagandha: Stress and Sleep Evidence, Safety

The short answer: two meta-analyses found ashwagandha extract lowered anxiety and stress scores (12 trials, 1,002 people) and modestly improved sleep (5 trials, 400 people). But heterogeneity was very high, trials were short and safety data are limited, so the true size of the effect is uncertain. It is not a longevity intervention. Talk to your doctor before taking it, especially with thyroid, liver or autoimmune conditions or pregnancy.

What the evidence shows

Grades follow the rubric.

The sleep review’s dose observation is what those trials used, not a recommendation. Ashwagandha sits in the graded supplement ladder among the stress and sleep tools; for evidence-based non-supplement options see sleep hygiene, breathwork and the stress protocol. Products (Amazon links, we may earn a commission; we did not verify price or contents): Jarrow, NOW.

Safety: rare liver injury

A case series from Iceland and the US Drug-Induced Liver Injury Network described five people who developed liver injury attributed to ashwagandha supplements. All had jaundice and symptoms such as nausea, itching and abdominal discomfort after 2 to 12 weeks; the injury was cholestatic or mixed, no one developed liver failure, and liver tests normalised within 1 to 5 months in four of them (one was lost to follow-up). Four of the five were also taking other supplements, and in one case rhodiola was a possible cause alongside ashwagandha; the authors concluded the cases show ashwagandha’s hepatotoxic potential. Five cases cannot give a rate, but they are why liver conditions are a reason to ask a doctor first.

Price at the daily amount the sleep review flagged

Read from the brands’ product pages on 29 Sept 2026, USD, before shipping. 600 mg a day is the level at or above which the sleep meta-analysis reported stronger effects; it is what those trials used, not a recommendation. The extracts differ, so prices are not like for like.

We could not read the milligram content for Jarrow, Momentous or Renue products, so we did not cost them.

Who it suits, who should skip it

Reasonable to discuss with a doctor if you want to try it for stress or sleep, have no liver, thyroid or autoimmune condition, and understand the trials were short and very heterogeneous.

Skip it, or ask first, if you have liver disease, are pregnant, have a thyroid or autoimmune condition, or want it for longevity. Non-supplement options are on the sleep hygiene and breathwork pages.

Method note

Read for this page: Ashwagandha and anxiety and stress, systematic review and meta-analysis of RCTs (Phytother Res 2022); Ashwagandha extract and sleep, systematic review and meta-analysis (PLoS One 2021); Ashwagandha-induced liver injury, case series from Iceland and the US Drug-Induced Liver Injury Network (Liver Int 2020), and 2 more listed above. Checked 29 Sept 2026. Abstracts only; grades are our judgement using the published rubric. We did not test any product. General information, not medical advice: this page gives no dose advice, only the amount the cited trials used.