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 Vitamin B12 Injection Dose for Adults: 7 Essential Dosage Facts & Schedules Liv Hospital B Complex vs B12 Injections: Comparison, Uses, and Precautions What Happens When You're Allergic to Vitamin B12
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