Foods containing vitamins A, D, E, K, and some of the B complex group are necessary in diets to maintain healthy skin and hair but, according to Dr. Leshin, "There is no evidence that vitamins or other additives are advantageous when applied to the skin." Glossary
Various organic substances that are, as far as is known, essential to the nutrition of many animals, acting usually in minute quantities to regulate various metabolic processes.
Vitamins are micronutrients that the body needs for good health. There are two groups of vitamins: fat-soluble (A, D, E, and K) and water-soluble (C, B group). Your body can store fat-soluble vitamins in fat tissues and liver and use them when needed. Water-soluble vitamins cannot be stored this way and need to be replaced often. Vitamins are indispensable for good health.