Ashwagandha: what it does, and what it's sold to do

Ashwagandha is in stress gummies, sleep blends, cortisol formulas and libido products, usually with claims that outrun the research by a wide margin. There is something real underneath. It's smaller than the marketing, and it comes with a safety note that rarely makes the label.

What the evidence actually supports

NIH's summary is measured: ashwagandha is promoted for stress and anxiety, sleep, male infertility and athletic performance, and some preparations may be effective for insomnia and stress. On anxiety specifically, the evidence is described as unclear.

The reason it stays hedged is structural. Most trials have been small, and they've used a variety of different ashwagandha preparations — which means results don't transfer cleanly from one bottle to another. "Ashwagandha worked in a study" and "this ashwagandha will work for you" are further apart than they sound.

What the evidence doesn't support

Dramatic hormone rebalancing, thyroid optimization, fixing infertility or chronic fatigue. Those claims are marketing, not trial findings. And on long-term use, NIH is explicit that there isn't enough information to draw conclusions about safety.

The part the label leaves off

There is a documented signal for liver injury. NIH's LiverTox database records roughly two dozen cases of clinically apparent liver injury attributed to ashwagandha, typically appearing 2 to 12 weeks after starting it, usually as a cholestatic or mixed pattern with jaundice and itching.

Context matters: most cases were mild to moderate and resolved within one to four months after stopping, and this is rare relative to how many people take it. But fatalities and transplants have occurred, particularly in people with existing cirrhosis. That's a real risk profile, not a theoretical one.

What to actually do

Ashwagandha should be avoided in pregnancy and while breastfeeding, and NIH advises against it before surgery and in people with autoimmune or thyroid disorders — which covers a meaningful share of our readers.

If you take it and develop jaundice, dark urine, itching or unexplained fatigue, stop and call your provider rather than waiting it out. And if you're on it long-term, that's worth mentioning at your next visit, because it belongs on your medication list even though it came from a shelf, not a pharmacy.