Vitamin D regulates the blood levels of calcium and phosphorus, by increasing the absorption of these minerals and by promoting them into the bones. Vitamin D does this by stimulating DNA to produce transport proteins, which bind to the calcium and phosphorus and increase absorption through the small intestine. This stimulating feature is unusual for a vitamin and normally a function of hormones. Vitamin D also stimulates the uptake of these minerals by bone cells. This process is helpful in building strong bones and healthy teeth.
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