Five micronutrients—vitamin B6, vitamin C, vitamin E, magnesium, and zinc—play roles in maintaining immune function, play roles in maintaining immune function, and supplements containing them are often sold as immune boosters in doses that greatly exceed the recommended daily allowance. However, there is no evidence that such supplements have more benefits than merely6 following a healthy diet. Rather than popping pills to get these micronutrients, you’re wiser to use various foods to boost your immune system.