What Is a Too High Level of Vitamin D in Blood?
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3 min read
According to the National Institutes of Health (NIH), blood levels of vitamin D above 125 nmol/L (50 ng/mL) are considered high and could cause health problems. A too high level of vitamin D in blood, known as hypervitaminosis D, is a rare but serious condition almost always caused by excessive supplementation, not sun exposure.
