Up&up l-lysine is an essential amino acid that cannot be made by the body.** l-lysine is one of the most crucial building blocks for protein.** proteins play a role in constructing and maintaining the critical structures and functions of the body.** l-lysine also supports the health and integrity of the skin.** **these statements have not been evaluated by the food and drug administration. This product is not intended to diagnose, treat, cure, or prevent any disease. . Up&up l-lysine 500 mg tablets contain no gluten, preservatives, artificial colors or flavors, soy, wheat or lactose.