Supports immune System -- Lysine may help with calcium absorption --. Supports production of collagen and tissue maintenance -- Important for balanced nutrition and health. Lysine plays an essential part in the production of carnitine, an amino acid which helps convert fatty acids into energy. Lysine is an essential building block for all protein which is particularly important to the proper growth and development of children. All Best Naturals products are manufactured in accordance with Good Manufacturing Practices (GMP), among the highest standards in the world