Vitamin C is most commonly associated with boosting the immune system. It plays a crucial role in the functioning of immune cells, supports skin health, and aids in the absorption of iron from plant-based sources. Additionally, it acts as an antioxidant, protecting the body from harmful free radicals. Regular consumption of vitamin C-rich foods like citrus fruits, berries, and leafy greens can enhance immune defense, reduce the duration of colds, and improve overall health.