Lysine What Is Lysine? Did you know that lysine is essential to your immunity and bone health? Read on to discover this important amino acid and how it may be your missing piece of the puzzle. Lysine is one of the 9 essential amino acids – essential because the body cannot produce it – therefore, it must come from the diet. What foods contain lysine? Legumes, dairy, fish and meat. While deficiency is rare, supplemental lysine can be useful to help bolster immunity, to protect and preserve bone health and stimulate collagen production. https://www.nationalnutrition.ca/amino-acids/single-aminos/lysine.html #Lysine