NOW Foods L-Lysine Hydrochloride 1000 mg offers double-strength vegan tablets to support collagen synthesis and healthy immune function. Lysine is an essential amino acid required for protein production and connective tissue maintenance, and it serves as a precursor to carnitine for fat metabolism and energy production. Soy free, non-GMO, vegan/vegetarian, nut free, made without gluten, dairy free, egg free, kosher. Natural color variation may occur.