Can we get vitamin D from sun exposure alone? Yes, we can get vitamin D from sun exposure alone. Sunlight is a natural source of vitamin D, and our bodies can produce it when our skin is exposed to ultraviolet B (UVB) rays from the sun. When UVB rays interact with a specific type of cholesterol in the skin, it triggers a series of reactions that eventually lead to the synthesis of vitamin D. However, the amount of vitamin D produced through sun exposure depends on various factors, including the time of day, season, geographical location, skin pigmentation, and the amount of exposed skin. In general, the most efficient time for vitamin D synthesis is when the sun is at its highest point in the sky, typically between 10 a.m. and 3 p.m. During this time, UVB rays are more intense, which increases the production of vitamin D. Using sunscreen can block its absorption as well. So it is important to keep a check on your vitamin D levels and supplement as needed. It's important to note that while sunlight can be a valuable source of vitamin D, excessive exposure to the sun without proper protection can also increase the risk of skin damage and skin cancer. Therefore, it's recommended to balance sun exposure with appropriate sun protection measures, such as wearing sunscreen, protective clothing, and sunglasses. Symptoms of vitamin D deficiency can vary, but some common signs and symptoms include: Fatigue and tiredness Bone and muscle pain Weakness Mood changes, such as depression Impaired wound healing Hair loss Frequent infections Impaired growth in children Bone loss (osteoporosis) in adults If you suspect a vitamin D deficiency, it's important to consult with a healthcare professional who can perform a blood test to accurately diagnose the deficiency and provide appropriate treatment or supplementation if necessary.