How Long Do Vitamin B12 Injections Stay In the Body? William 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 Rationale for VeganHealth's B12 Recommendations Vegan Health Vitamin B12 Vitamin D Life Vitamin B12 Deficiency New England Journal of Medicine
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