Vitamin B12 is absorbed through two pathways. The first is intrinsic factor, a protein produced by parietal cells in the stomach. IF binds B12 in the small intestine and carries it across How Quickly Do B12 Shots Work? Defy Medical 9 Best Vitamin B12 Supplements Hydroxocobalamin (Vitamin B12): Uses, Alternatives, Side Effects & More GoodRx
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