Tribulus terrestris has been used for centuries in ancient Greece, India and Africa to support fertility and rejuvenate the body. Recent scientific studies indicate that, although it actually contains no hormones, Tribulus Enhances to support healthy hormone production and male reproductive health. Tribulus has been used by some of the world's most elite athletes, but may be used by the recreational athlete as well. Our minimum 45% saponin content makes NOW® Tribulus one of the most potent formulas available.