Product description l arginine is a non essential amino acid which means that it can be synthesised by the body and is not reliant on diet alone the body however may not be able to manufacture a sufficient amount in times of stress trauma rapid growth and other physical stresses arginine is required by the body to make nitric oxide no which relaxes blood vessels and supports blood flow it is also required for muscle growth directions of use 2 6 capsules daily best taken 30 minutes