Chrysin

Tier 3 — weak evidence · Aromatase inhibitor · Testosterone

A flavonoid from passionflower and honey with aromatase-inhibiting activity in test tubes. However, oral bioavailability is extremely poor (~1%). Human studies show no meaningful effect on testosterone or estrogen at standard supplement doses. Marketing claims are not supported by clinical data. Not recommended as a testosterone booster.

Dose: 500–2,000 mg/day; very poor oral bioavailability limits real-world effectiveness