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