Ashwagandha, honestly — real stress signal, real safety caveat

Ashwagandha is one of the better-evidenced herbal supplements for stress — with a genuine caveat most sellers skip. The honest headline: short trials show real reductions in stress and cortisol, but the studies are brief and there’s a documented, if rare, liver-injury risk.

An adaptogen with actual trials

Ashwagandha is an herb used in traditional Ayurvedic medicine, marketed as an "adaptogen" for stress. Unlike many herbal products, it has been tested in randomised trials — and some show a real effect on stress markers.

The honest picture is a genuine short-term signal, wrapped in the usual supplement caveats: short studies, variable product quality, and a safety flag worth knowing.

What the evidence shows

Promising short-term; watch the caveats.

• It lowers cortisol and anxiety in short trials — A 60-day randomised trial of a standardised extract reduced morning cortisol and anxiety scores versus placebo, echoing earlier cortisol-reduction studies. A real, if modest, effect. (emerging)
• The trials are short and small — Most run 8–12 weeks with modest numbers, and product potency varies. Long-term effects are essentially unstudied. (note)
• Real, rare liver-injury risk — There are documented case reports of ashwagandha-induced liver injury, catalogued by drug-safety databases. Rare, but real — a reason to be cautious, especially with pre-existing liver issues or other medications. (note)

What we still don’t know

• Long-term safety and benefit Beyond a few months, we simply don’t have data on either efficacy or safety.
• Who is at risk of liver injury The liver-injury cases are idiosyncratic and unpredictable; we can’t yet identify who’s susceptible.

Key terms

• Ashwagandha An Ayurvedic herb marketed for stress; some randomised trials show short-term cortisol and anxiety reduction.
• Adaptogen A marketing term for substances claimed to help the body resist stress — a loose, non-clinical label.
• Cortisol The body’s main stress hormone; reduced by ashwagandha in some short trials.
• Hepatotoxicity Liver injury caused by a substance — a rare but documented risk with ashwagandha.