Prelox is a patented combination of two naturally occurring substances, L-Arginine and Pycnogenol. L-Arginine is an amino acid found in many foods, whereas Pycnogenol can only be obtained from an extract of the French Maritime pine tree (also known as Pinus pinaster). Pycnogenol supports normal blood circulation throughout the body, including the genital area. Prelox is a patented combination of two naturally occurring substances, L-Arginine and Pycnogenol. L-Arginine is an amino acid found in many foods, whereas Pycnogenol can only be obtained from an extract of the French Maritime pine tree (also known as Pinus pinaster). Pycnogenol supports normal blood circulation throughout the body, including the genital area.