Zinc has many beneficial roles in the body, including contributing to: The maintenance of normal bones, hair, skin and nails The normal metabolism of fatty acids, vitamin A & carbohydrates Normal DNA synthesis Normal protein synthesis Normal cognitive function Normal fertility and reproduction Normal testosterone levels in the blood Normal immune function Normal acid base metabolism. Zinc also plays a role in cell division. 4 lozenges will provide the full RDA of Zinc., , Directions for Use: For optimum benefit, slowly suck 1 lozenge four times a day. Do not exceed the recommended intake.