Anthocyanin, found in blueberries, is an antioxidant flavonoid that can help enhance the immune system.
Blueberries
Dark chocolate includes theobromine, an antioxidant that may help enhance the immune system by shielding cells from free radicals.
Dark chocolate
Broccoli also has vitamin C. It also has antioxidants like sulforaphane. Because of these factors, it's a wonderful choice for immune system health.
Broccoli
Beta carotene gives sweet potatoes their orange skin.
Sweet potatoes
Spinach's minerals and antioxidants may improve the immune system.
Spinach
Ginger contains anti-inflammatory and antioxidative effects, a review says. More research is needed to determine its effectiveness in preventing disease.
Ginger
Garlic prevents colds and other illnesses.
Garlic
Almonds also contain vitamin E. Mango, magnesium, and fibre.
Almonds
Oranges and kiwis are high in vitamin C, which many people seek out when a cold is developing.