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It is my understanding that vitamin D intoxication from the sun does not occur because the body prevents further vitamin D production when it has enough. One issue is that this process is bypassed with supplementation, which makes vitamin D intoxication possible. Why not determine the optimum human 25OHD level by figuring out when the body halts production rather than inferring that level from less direct phenomenon?

Asked by  Andrew on August 12, 2015

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