Zinc Plus D3 supplement combines zinc bisglycinate, one of the most absorbable and effective forms of zinc for the human body, with vitamin D3. Zinc and vitamin D3 contribute to the normal functioning of the immune system. Zinc: contributes to the protection of cells from oxidative stress, the maintenance of normal bones, hair, nails, skin and vision, normal reproduction and fertility, the maintenance of normal blood testosterone levels, normal cognitive function, normal acid-base metabolism, macronutrient metabolism (carbohydrates, fat acids) and vitamin A, normal protein and DNA synthesis, plays a role in the process of cell division. Vitamin D3: contributes to the normal absorption/use of calcium and phosphorus, normal blood calcium levels, the maintenance of normal muscle, bone and tooth function, plays a role in the process of cell division.