Vitamin D is primarily gained from exposure to sunlight. When the skin is exposed to ultraviolet (UV) rays, it synthesizes vitamin D from cholesterol. This vitamin plays a crucial role in maintaining bone health by aiding calcium absorption in the gut. Additionally, it is involved in immune function and has been linked to various health benefits, including mood regulation and heart health. Inadequate exposure to sunlight may lead to deficiencies, resulting in health issues like rickets in children and osteomalacia in adults. Therefore, moderate sun exposure is essential for adequate vitamin D levels, especially in regions with limited sunlight during certain seasons.