NOW Foods, Double Strength L-Lysine, 1,000 mg, 100 TabletsEssential Amino Acid Supports Collagen Synthesis Healthy Immune Function Non GMO A Dietary Supplement Vegetarian Vegan Kosher Amino Acids Family Owned Since 1968 Halal GMP Quality Assured Lysine is an essential amino acid that must be obtained through the diet or through supplementation. Lysine is necessary for the production of all proteins in the body, and is required for the maintenance of the structural proteins collagen and elastin, which form