The role of vitamin D in overall health is multifaceted, as it is essential for maintaining bone health, immune function, and even mood regulation. Vitamin D facilitates calcium absorption, crucial for bone mineralization, helping to prevent conditions such as osteoporosis. It also plays a role in modulating the immune system, reducing the risk of infections and developing certain diseases. Additionally, adequate levels of vitamin D are linked with improved mood and may help mitigate symptoms of depression. Sources include sunlight exposure and foods like fatty fish and fortified dairy products.