L-arginine is an essential amino acid for protein building in the human body. This Now Foods product contains 1000mg of high-quality L-arginine, tested in independent laboratories to ensure its purity. It is suitable for a vegan diet and does not contain gluten or soy. Take 1 tablet per day between meals with plenty of water. Dietary supplements do not replace a balanced and varied diet. Store out of reach of children. Consult your doctor if you want to use dietary supplements and are being treated for a disease, or if you are pregnant or breastfeeding.