Many nutrients are critical for proper immune function. Chronic low-grade infections are very common in Americans these days. These include everything from chronic sinusitis to fungal overgrowth in the bowels, skin, nails, and elsewhere. If you have a diagnosis of spastic colon, you probably have a bowel infection that your doctor may not know how to look for. Vitamin C (200 to 500mg a day), vitamin A, zinc, selenium, and folate are only a few of the nutrients that are critical for immune-system support. Most people do not get optimal amounts of these nutrients.
Other critical nutrient functions include (among many others) maintaining healthy blood vessels to prevent heart attacks and strokes, maintaining proper hormonal balances, maintaining healthy bones, and preventing birth defects.