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Vitamin D helps reduce risk of major medical events

Doctors disagree on the best level of vitamin D to maintain health. To help answer the question, researchers in one study tested the link between vitamin D levels and major medical events such as heart attack, hip fracture, cancer or death in 1,621 healthy Caucasian adults over age 65 who were living in four different climate areas of the U.S.

Over an 11-year follow-up period, doctors compared the levels of vitamin D circulating in the blood to the amount of time until a first defining medical event. Researchers found that the chances for any major disease event decreased significantly when vitamin D levels rose above 20 nanograms per milliliter of blood, which is the same as 50 nanomoles per liter of blood. Labs measure vitamin D both ways.

Doctors also said that vitamin D levels varied seasonally, with the highest levels in summer, the lowest in winter, and autumn generally higher than springtime.

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