The Testrol Advantage Testrol is the ultimate dual-purpose male performance product that contains some of the most advanced testosterone boosting ingredients. Testrol is a natural and effective way to help build muscle and support male performance. Primary features include: nitric oxide boosters, support male hormone production, male perfornace enhancers. This formula can be taken daily for ongoing maintenance of sexual health or as a testosterone booster. Solid performance ingredients to increase your performance including: TRIBULUS TERRESTRIST EXTRACT (steam and fruit) (45% saponins; 40:1 extraction ratio). Tribulus has a history of traditional use supporting sexual and physical health. Tribulus helps support healthy hormone production and male reproductive health. L-ARGININE HCL is an amino acid that is the immediate precursor of nitric oxide. As a precursor, Arginine plays a vital role in vasolialation. EPIMEDIUM, A.K.A HORNY GOAT WEED, has a history of traditional use in enhancing sexual performance. AVENA SATIVA (GREEN OATS), works by freeing up testosterone that gets stuck to various compounds in the body. As we age, the bounding-up of testosterone gets worse. It is also one of the major hormones that provides fertile ground for muscle growth.