15. Milk

Milk isn’t just good for calcium; it’s also an excellent source of selenium and zinc, both of which help immunity. Just one cup of milk contains 7% of zinc and 11% of selenium. A study in 2018 found that milk may help decrease asthma, allergies, and respiratory tract infections. 

14. Garlic

Garlic does more than keep vampires away; it also keeps you healthy. The healthy component in garlic comes from allicin, a sulfuric compound that keeps the immune system in top shape. So, add as much garlic as you’d like into your Caesar salad, because it’s good for you. 

13. Yogurt

Yogurt, as long as it contains live cultures, works excellently as a probiotic. Along with probiotics, yogurt also contains magnesium, selenium, and zinc. These trace minerals enhance the immune system and keep harmful bacteria from making you sick.