You need to get lysine from food or supplements because your body cannot make it. It serves as a building block for proteins and helps with tissue repair and growth. Lysine also assists with calcium absorption and collagen formation, which supports bones and connective tissue.
People often take lysine to support the immune system and to keep skin healthy, especially around the lips. Many start using it at the first signs of immune stress, while others use it daily.
Take lysine between meals on an empty stomach for the best absorption. You can take it with food if it bothers your stomach. Watch out for digestive upset at high doses. Check with a professional if you have kidney or liver issues. Lysine interacts with certain antibiotics and with arginine supplements.