Does Vitamin Status Matter?

Some experts believe that taking a daily multivitamin can help ensure you're meeting at least your daily minimum requirement for certain nutrients. Vitamins that are critical for immune function include vitamins A, C, D, and E. Zinc, selenium, and magnesium are minerals that your immune system needs to function at its best. These minerals are also critical for the function of many enzyme reactions in the body. Your immune system and body can't function at their best without the basic building blocks they need to work properly.