Vitamin D is the vitamin primarily obtained from sunlight. When skin is exposed to ultraviolet B (UVB) rays from the sun, it synthesizes vitamin D, which plays a crucial role in maintaining bone health, immune function, and overall well-being. This vitamin aids in the absorption of calcium and phosphorus, essential for strong bones and teeth. Dietary sources of vitamin D include fatty fish, fortified foods, and supplements, but sunlight is a major natural source. The amount of vitamin D produced can vary based on factors such as geographic location, time of year, and skin pigmentation, emphasizing the importance of balancing sun exposure.