Blueberries contain a type of flavonoid called anthocyanin, which has antioxidant properties that can help boost a person's immune system.
2. Dark chocolate
Dark chocolate contains an antioxidant called theobromine, which may help to boost the immune system by protecting the body's cells from free radicals.
Consuming turmeric may improve a person's immune response. This is due to the qualities of curcumin, a compound in turmeric.
4. Oily fish
Salmon, tuna, pilchards, and other oily fish are a rich source of omega-3 fatty acids.
Broccoli is another source of vitamin C. It also contains potent antioxidants, such as sulforaphane.
6. Sweet potatoes
Sweet potatoes are rich in beta carotene, a type of antioxidant that gives the skin of the potatoes its orange color.
Spinach may boost the immune system, as it contains many essential nutrients and antioxidants.
Ginger has anti-inflammatory and antioxidative properties and is likely to offer health benefits
Garlic is a common home remedy for the prevention of colds and other illness.
10. Green tea
Green tea contains only a small amount of caffeine, so people can enjoy it as an alternative to black tea or coffee.
12. Sunflower seeds
They are a rich source of vitamin E, an antioxidant.
Almonds are another excellent source of vitamin E. They also contain manganese, magnesium, and fiber.
14. Oranges or kiwifruit (kiwis)
Oranges and kiwis are an excellent source of vitamin C, which is the vitamin that many people turn to when they feel a cold
15. Red bell pepper
For people trying to avoid the sugar in fruit, red bell peppers are an excellent alternative source of vitamin C.