Enhance is formulated to boost your nitric oxide production levels. Our proprietary blend provides a potent serving of the amino acids L-arginine and L-citrulline which are precursors to Nitric Oxide production in the body. With higher nitric oxide levels, you gain the benefits of better blood flow, circulation and stamina. In addition to its many advantages, L-Arginine has also been known to improve bedroom appetites and overall sexual health. (90 day supply)