L-lysine is an essential amino acid meaning it must be provided in the diet as the body cannot manufacture it. L-lysine plays a number of role in the body including supporting the health of the skin and is involved in promoting collagen production. Note: This product is not intended to diagnose, treat, cure, or prevent any disease, nor should supplements be used as a substitute for a balanced diet. Not intended for pregnant/breastfeeding mothers or children under 18. Do not exceed the recommended dose.