D3 & K2 Support: Take Dr. Berg's Advanced Evaluation Quiz: In this video, Dr. Berg talks about the uncommon facts about vitamin D. Vitamin D is responsible for the absorption of calcium primarily by 20x in the small intestine and it also increases absorption of iron, magnesium, zinc and phosphate to mineralize the bone and supporting other tissues in the body. But it has to be activated through an enzyme in the liver and the
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