Prelox is a patented combination of naturally occurring ingredients, L-arginine aspartate & Pycnogenol®. L-Arginine is an essential amino acid found in many foods. Pycnogenol® is obtained only from an extract of the bark of the French Maritime pine tree. The unique interaction of these two substances may help to maintain healthy blood vessels & sustain blood flow to the genital area, which is important in the body’s sexual response, ability to maintain erections & ultimate sexual satisfaction. Prelox is a blend of L-Arginine & Pycnogenol. L-Arginine is used by the body to form a substance called nitric oxide which plays an important role in controlling blood vessel diameter, & hence blood circulatory flow. Pycnogenol® contains substances which activate enzymes within the body necessary for converting L-Arginine into nitric oxide.