J
j.
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When blood vitamin D is 10 ng/ml or less, PTH levels are highest. As vitamin D is increased, they drop rapidly until about 30-40 ng/ml, where PTH levels stop dropping.
Source: youtube video on http://www.drholicksdsolution.com/hear-dr-holick/ 24:54
Source: youtube video on http://www.drholicksdsolution.com/hear-dr-holick/ 24:54