Dietary Supplement. L-Lysine is Essential for Maintenance of Nitrogen Balance*. L-Lysine is an essential amino acid. Amino acids are the building blocks of protein and help fuel skeletal muscles.*. Each tablet supplies 500 mg of free-form L-Lysine. Kosher and Vegetarian. No Sugar, No Starch, No Artificial Colors, No Artificial Flavors, Sodium Free, No Wheat, No Gluten, No Corn, No Soy, No Dairy, Yeast Free. Potency verified by GNP procedure #5014. Conforms to USP for weight. Meets USP disintegration.