Vitamin D is a fat-soluble vitamin in a family of compounds that includes vitamins D1, D2, and D3. Your body produces vitamin D naturally when it’s directly exposed to sunlight. You can also get vitamin D from certain foods and supplements to ensure adequate levels of the vitamin in your blood. Sources of vitamin D include yolk, milk, cereals and salmon.
Vitamin D has several important functions. Perhaps the most vital are regulating the absorption of calcium and phosphorus and facilitating normal immune system function. Vitamin D helps regulate the amount of calcium and phosphorus in the body.
These nutrients are needed to keep bones, teeth and muscles healthy. A lack of vitamin D can lead to bone deformities such as rickets in children, and bone pain caused by a condition called osteomalacia in adults. People who do not have adequate vitamin D levels might be at increased risk of infections and autoimmune diseases, such as rheumatoid arthritis and inflammatory bowel disease.
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