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 helps 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. Standardized extract. Vegetarian/vegan. A dietary supplement.