The vitamin that we mainly get from sunlight is Vitamin D. When our skin is exposed to UV rays from sunlight, it synthesizes Vitamin D, which plays a vital role in maintaining bone health by helping the body absorb calcium and phosphorus. Additionally, Vitamin D supports immune function, mental health, and various metabolic processes. While it can be obtained from certain foods and supplements, sunlight exposure remains the most efficient way for the body to produce this essential nutrient.