to contain: Tribulus terrestris ; Yohimbe Extract; Niacin ; Epimedium ; Avena sativa ; Zinc Oxide; Maca; Muira Pauma; Ginkgo biloba ; L- Arginine ; Saw Palmetto . Other ingredients: gelatin, rice bran, oat fiber, magnesium stearate, silicon dioxide. References Dr. John R. Brinkley began a fad for finding cures for male