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.

Oranges

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