More studies needed
To better determine whether vitamin D lowers cancer risk, controlled trials are needed in which participants' blood levels are measured, and other data on diet and supplements is collected, Chung said.
Taking vitamin D along with calcium has been associated with an increased risk of kidney stones, she noted.
In the body, almost every organ has receptors for the active form of Vitamin D found in our blood, Chung said, which is known to affect many cellular processes. Better understanding of the vitamin's role in all such processes would be helpful in assessing the vitamin's potential in preventing diseases, she said.
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