NOW Foods L-Lysine Capsules, 500 Mg, 100 Ct by now foods $11.99 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart NOW Foods' features L-Lysine, which is an essential amino acid, meaning that it cannot be manufactured by the body. It must be obtained through the diet or by supplementation. Supports collagen synthesis Healthy immune function