Not one, single, solitary mention of blood work analysis as a portion of this "study." They only quantified 1) how many people took D in greater than 1000iu dose and 2) how took a dose greater than 4000iu.
IMO, totally worthless study for the purposes of stating that "many Americans" are taking too much. I know from BW that I have to take 5000iu at a minimum to maintain an optimal level, and in the winter I bump that to 10000iu.
Many Americans Taking Too Much Vitamin D
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