Vitamin C is a powerhouse antioxidant that plays a vital role in supporting immune function. It helps stimulate the production of white blood cells, which are essential for fighting infections. Vitamin C also acts as an antioxidant, protecting cells from damage caused by free radicals. Including vitamin C-rich foods like citrus fruits, strawberries, and bell peppers in your diet, or taking a vitamin C supplement, can bolster your immune defenses.