Harvard Heart Letter

Vitamin D: Cardiac benefits uncertain

Although studies have associated low levels of vitamin D with increased risk of cardiovascular events or death, they have not shown that taking vitamin D supplements can protect against such events. Experts advise consuming 600–800 international units of vitamin D a day through food and/or supplements, since this amount is known to improve bone health. Consuming more vitamin D is not advised, since the vitamin increases calcium absorption, which may lead to kidney stones and heart disease.
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