Pure Encapsulations Zinc-citrate offers support for the defense system, tissue and metabolism. Zinc is a very important mineral. Its involved in many essential physiological functions. One of these functions is supporting the formation of collagen and tissues. Collagen is a structural protein that works with connective tissue, cartilage, and bone matters; it promotes elasticity in the skin and strength in the blood vessels. Meanwhile, healthy tissues are better able to breathe and circulate oxygen throughout the body with the help of zinc. Furthermore, zinc plays a vital role in strengthening your immune system. It does so by supporting the effective functioning of T-lymphocytes, natural killer cells, and neutrophils. Increased immunity lessens your chances of coming down with sickness. Recommended use: 1 capsule daily, with a meal or as directed by a healthcare professional.