Vitamin A, D, C, B6, B12 and folate contribute to the normal function of the immune system. Vitamin C, B6, B12, niacin and folate contribute to normal energy-yielding metabolism.
Vitamin C, B6, B12 and niacin contribute to the normal functioning of the nervous system, normal psychological function and reduction of tiredness and fatigue.
Vitamin A, niacin and biotin contribute to the maintenance of normal mucous membranes and normal skin. Vitamin E and C contribute to the protection of cells from oxidative stress.