Indonesian/Malaysian herb that raises free testosterone (by reducing SHBG binding) and has measurable libido and stress effects. Standardized extracts (LJ100, Physta) have human RCTs.
Dose: 200-400mg standardized extract daily.
Caveats: Cycle 5 days on, 2 off, or 8 weeks on, 2 off. Avoid stacking with stimulants. Sleep can suffer if dosed late.