says Mary Rooney, MPH. About 3% of American adults are using high-dose supplements of the vitamin, consuming more than the maximum safe daily dose of 4,000 IU.
This can lead to dangerous calcium deposits in the blood, which can cause fatigue, constipation, headaches and other symptoms and has been linked to greater risk for certain cancers.
Source: Bottom Line Personal August 2017 Mary Rooney, MPH, is a doctoral student in the division of epidemiology and community health at University of Minnesota, Minneapolis, and lead author of a research letter published in JAMA.
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