What is L-Argininenbsp L-Arginine is an amino acid one of 21 in fact that are found naturally in the human body Amino acids are critical to life & have many functions in metabolism One particularly important function is to serve as the building blocks of proteins They are also a source of energy much like fats & carbohydrates What does L-Arginine do Arginine is a precursor to nitric oxide which is used by the body to help relax blood vessels which in turn helps maintain healthy blood flow around the body Arginine has become a very popular supplement for sports people body builders & people following a healthy workout plansnbspthat are designed to turn fat into muscle Due to its role in maintaining & supporting healthy blood flow l-arginine supplements have also become popular with older adults who wish to enjoy being sexually active High strength L-Argininenbsp H Cl withnbsp 1000mgnbspin each capsule Just Vitamins L-Argininenbsp H Cl high strength capsules provide 1000mg in each fully vegetarian capsule