Vitamins help your body grow and work the way it should. There are 13 vitamins—vitamins A, C, D, E, K, and the B vitamins (thiamine, riboflavin, niacin, pantothenic acid, biotin, B6, B12, and folate. Vitamins and minerals are considered essential nutrients—because acting in concert, they perform hundreds of roles in the body. They help shore up bones, heal wounds, and bolster your immune system. They also convert food into energy, and repair cellular damage. Vitamins present in Once Daily multivitamin include vitamin A, vitamin C, vitamin D, vitamin E, and B-group vitamins in B1, B2, B3, B5, B6, B7, B9, and B12. * Vitamin A is essential for eye health, and its deficiency could cause night blindness and keratomalacia.