Fat-soluble vitamins can be stored in human tissues. If over consumed, they can build up to toxic levels. Some vitamins like A, C, and E are important antioxidants. Antioxidants prevent your cells from being damaged by oxygen free radicals which are formed by stress and pollution. Free radicals promote heart disease and cancer.
Men are often larger than women and require more nutrients.
In addition, children often require different amounts for growing bones. The biological effects of pregnancy and menopause can also change a person's nutritional needs. Vitamin A Needed for eyesight , immune system function, and growth of bones. Helps maintain healthy epithelial tissues which line surfaces and cavities such as the skin. Helps bone growth and vision by maintaining the cornea.