Skin cells are impervious to many chemicals and are an effective barrier against bacteria. However, without vitamin A, these cells would not be able to perform their protector function. Chemicals and bacteria would then be more able to penetrate the body. The body needs vitamin C to maintain normal levels of plasma during acute emotional or environmental stress. Plus, a rich source of vitamin C is necessary in the formation of white blood cells, which bear the brunt of the battle against bacteria and viruses.
Vitamin E helps protect red blood cell membranes against oxygen damage.
Red blood cells become more fragile when exposed to circulating oxygen in the bloodstream. Selenium stimulates formation of antibodies that combat bacteria, viruses and cancer cells. These killer cells are your body's major line of defense against disease. Another Reason to Exercise Another factor that helps maintain immune system strength is regular exercise. For example, exercise burns up hormones like noradrenalin, released during everyday stress.