Withania somnifera, traditionally used in Ayurveda. Modern trials show 600mg/day of a standardized extract (KSM-66 or Sensoril) reliably lowers cortisol, improves sleep, and modestly increases testosterone in men.
Dose: 600mg KSM-66 daily, with food. Cycle 8 weeks on, 2 weeks off.
Caveats: Avoid in hyperthyroidism (mildly stimulates thyroid). Not for pregnancy. Some users report blunted emotional range.