Niteworks contain 5.2 grams of L-arginine and arginine I very essential to the body because arginine is an alpha amino acid and is one of the 20 most common natural amino acids. It plays an important role in cell division, the healing of wounds, removing anemia from the body, improve immune function, and helps regulate the release of hormones. Arginine is also a precursor for the synthesis of nitric oxide, the main target of Niteworks. Arginine also quickens the repair time of tissues and helps decrease blood pressure. Other than that, arginine is also used in the treatment of herpes simplex.