Healthy immune system is important for good health. Wellman includes vitamins A, C, D, B6 and B12 with folic acid and copper which contribute to the normal function of the immune system. Each tablet provides 10 mcg vitamin D, the level recommended by the UK Department of Health. Wellman provides zinc which contributes to normal reproduction and the maintenance of normal testosterone levels in the blood. The formula also includes selenium which contributes to normal spermatogenesis. Since men lose an estimated 5 mg of zinc every time they ejaculate, a good intake of zinc is essential. Folate, iron, magnesium and vitamin B12 have a role in cell division, plus vitamin A which has a role in the process of cell specialisation.