Nutrition and the deleterious side effects of nutritional supplements

The potential adverse effects associated with some of the more common oral vitamin supplements—vitamins A, D, and E and niacin (forms include nicotinic acid and nicotinamide), and mineral supplements—zinc, copper, and iron, used in dermatology are manifold. Although the dermatologist may be familiar with adverse effects of vitamins A and D, less well-known adverse effects, such as hematologic and neurologic effects from zinc, are presented.