A key nutrient important for supporting immune function is vitamin C. This vitamin plays a crucial role in enhancing the production of white blood cells, which are essential for fighting infections. Vitamin C also acts as an antioxidant, protecting the body from damage caused by free radicals. Consuming sufficient amounts through fruits and vegetables, such as oranges, strawberries, and bell peppers, can boost overall immunity, particularly during periods of illness or stress, making it vital for health maintenance.