Vitamin A plays an essential role in the function of retina and is essential for growh and differentiation of epithelial tissue. Vitamin C: Necessary for collagen formation and tissue repair; plays a role in oxidation/reduction reactions as well as other metabolic pathways including synthesis of catecholamines, carnitine, and steroids; also plays a role in conversion of folic acid to folinic acid. Vitamin E plays a role in protecting red blood cells against hemolysis; has protective effects against free radicals on polyunsaturated fatty acids found in cell membranes; plays a role in preventing oxidation of vitamin A and C. Vitamins and...