• Vitamin B6 is vital to supporting biochemical reactions in the immune system. Vitamin B6-rich foods include chicken and cold-water fish such as salmon and tuna. Vitamin B6 also is found in green vegetables and in chickpeas, which is the main ingredient in hummus.
  

• Vitamin E is a powerful antioxidant that helps the body fight off infection. Foods rich in vitamin E include nuts, seeds, and spinach.
  

How to grocery shop to boost your immunity

A simple rule can help you when choosing fruits and vegetables at the grocery store or farmers market: The more colorful the fruits and vegetables are, the better.

Try to eat a wide variety of food, and aim to eat fruit and vegetables from every color of the rainbow. “Your plate is more enticing to look at, and you will ensure that you’re getting as many health-boosting vitamins and nutrients as possible.”

It’s also important to know that you build a strong immune system by maintaining healthy eating habits over time. You can’t eat four oranges at breakfast and expect to be protected that day against catching a cold.

Can supplements help your immunity?

While vitamins and supplements can help fill in the gaps in your diet, the best way to load up on essential nutrients is to get them straight from food.

Your body absorbs and uses vitamins and nutrients better when they come from a dietary source. When it’s a vitamin or supplement,  it’s often questionable how much you’re actually getting. Because supplements are regulated as foods, not as drugs, the Food and Drug Administration doesn’t evaluate the quality of supplements or assess their effects on the body.

''Some supplements may have side effects, especially if taken before surgery or with other medicines. Supplements can also cause problems if you have certain health conditions. And the effects of many supplements haven’t been tested in children, pregnant women and other groups.''

It’s especially important to avoid taking vitamin E supplements. Not only is there little clinical research showing that vitamin E supplements benefit your health, but they may also be harmful in some situations.

For these reasons, it’s best to get vitamins through food rather than supplements.

“Talk with your healthcare provider if you’re thinking about taking dietary supplements,” 

Staying hydrated can boost your immune health too. Water helps your body produce lymph, which carries white blood cells and other immune system cells. Try to avoid overdoing beverages that can made you dehydrated, like coffee. Or try eating more hydrating foods, such as cucumbers, celery or watermelon.