
Vitamin D is a fat-soluble vitamin that regulates the absorption of calcium and phosphorus as well as facilitates normal immune system function. This vitamin is an essential nutrient important for strong bones. Vitamin D has 2 forms: D2 (obtained from foods you eat) and D3 (obtained from sun exposure). Vitamin D is produced by the body when your skin is exposed to sunlight. You can also get vitamin D through certain foods and supplements. It's important to get enough of this vital nutrient so you don't end up with a vitamin D deficiency.
Vitamin D can boost your immune system, support muscle function, keep your heart healthy, and aid in brain development. Vitamin D may also reduce your risk of multiple sclerosis and depression.

Your body needs vitamin D to help absorb the calcium and phosphorus in your diet that makes for strong bones. Vitamin D deficiency can cause bone loss, low bone density, and increase your chances of breaking bones. Vitamin D deficiency can also cause rickets in children and a condition called osteomalacia in adults. Symptoms may include weakness and bone pain.

Higher blood levels of vitamin D seem to be associated with a lower risk of developing multiple sclerosis (MS). A recent study shows vitamin D may slow the progression of the disease, though the connection between the vitamin and MS is not clear. It is unknown if low levels of vitamin D cause MS or are a result of the disease. MS is more common in areas north of the equator, suggesting that the amount of sunshine one receives is connected to their likelihood of developing MS. People are less likely to develop MS if they have higher vitamin D levels. Supplementation with vitamin D may be beneficial for MS patients, but the dose is yet to be determined.
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