tps://www.westonaprice.org/health-topics/abcs-of-nutrition/from-seafood-to-sunshine-a-new-understanding-of-vitamin-d-safety/
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Vitamin D: What it Is, Why you Need It, and Why any Supplement Won’t Do
http://www.biodynamicwellness.com/vitamin-d-what-it-is-why-you-need-it-and-why-any-supplement-wont-do/
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