Vitamin D: More May Not Be Better (from Johns Hopkins media)

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"People should consult with their doctors, Amer says, before starting vitamin D supplements and should have their blood levels checked. Still, he says, “most healthy people are unlikely to find that supplementation prevents cardiovascular diseases or extends their lives,” and there is no consensus among doctors on what is the right level of vitamin D in the blood for healthy people.
“There are a lot of myths out there and not enough data,” he concludes."