Does ashwagandha raise testosterone?

Possibly. Ashwagandha is one of the few herbal supplements with real, if modest, evidence behind it, mainly by lowering stress rather than acting as a direct testosterone booster.

Ashwagandha is an adaptogen, a herb traditionally used to help the body handle stress. Several small randomised trials have found that standardised extracts, often KSM-66 or Sensoril, modestly raised testosterone and improved sperm quality in some men, alongside clear reductions in cortisol, the stress hormone that works against testosterone. A few studies also reported small gains in strength and muscle when it was combined with resistance training. The effects are moderate rather than dramatic, and the strongest results tend to appear in stressed or sub-fertile men rather than already-healthy ones.

The realistic way to see it is that ashwagandha helps most by taking the cortisol load off, which indirectly supports testosterone, sleep and recovery. Among a sea of largely useless testosterone boosters, it is one of the better-evidenced options, but it is still working at the margins rather than transforming a healthy man. It is also worth knowing the safety caveats before you start, which are covered in full in ashwagandha side effects.

The cortisol effect is the most consistent finding, with several trials reporting meaningful reductions in the stress hormone over eight to twelve weeks. Since cortisol and testosterone sit on opposite ends of a seesaw, lowering one tends to take pressure off the other, which is the likeliest route by which any testosterone benefit appears.

What to do: if you want to try it, look for a standardised root extract (KSM-66 or Sensoril), commonly dosed around 300 to 600 mg a day, ideally for at least 8 to 12 weeks. It is generally well tolerated, but check with your doctor if you have thyroid problems or take sedatives, and avoid it in pregnancy. Treat it as a useful add-on to sleep, training and stress management, not a replacement for them.

Go deeper: see the full evidence-based guide to ashwagandha (KSM-66) — dose, timing and safety.