Active amino acid compound content Mega Capsules packaging Arginine is an amino acid that is produced in the pituitary gland. It means that arginine is not an essential nutrient, but during a heavier load your body might not be able to produce it in adequate quantities. Therefore, the intake of arginine as a food supplement might become necessary (it is conditionally essential). Arginine plays a very important role in the synthesis of nitric oxide, also known as nitrogen monoxide or NO. 1 serving (1 capsules): 825 mg L-arginine HCl We recommend L-Arginine capsule if you: do endurance sports, to be taken prior to workout are a bodybuilder are sensitive to additives Like all BioTech USA products, L-Arginine capsule consists of safe and carefully selected ingredients.