From the Manufacturer's Label:
Minimum 45% Saponins
Tribulus terrestris has been used for centuries in ancient Greece, India and Africa to rejuvenate the body.** 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.
Manufactured by Now® FoodsContains no sugar, salt, starch, yeast, wheat, gluten, corn, soy, milk, egg, shellfish or preservatives