Vitamin D plays a crucial role in immune function by enhancing the pathogen-fighting effects of monocytes and macrophages, which are white blood cells essential for immune defense. It helps regulate the immune response and reduces inflammation, promoting better health. Additionally, Vitamin D supports the absorption of calcium, crucial for maintaining strong bones. A deficiency can lead to increased susceptibility to infections and a range of health issues. Thus, maintaining adequate levels of Vitamin D through sunlight exposure or dietary sources is important for overall health and immune resilience.