Lamberts L-Lysine 1000mg provides a high-grade lysine called USP, which is the quality used in clinical nutrition products. Lysine is an essential amino acid that our bodies cannot make, so we rely on our diets to provide sufficient lysine. It plays a crucial role in the formation of collagen, the most abundant protein in the body. We require 2-3g of lysine per day, and it is most abundant in animal-based foodstuffs such as meat. Vegetables and vegetable proteins are not particularly high in lysine, which may be a concern for those following vegetarian or vegan diets. Take 1-2 tablets daily as directed.