Are B12 Injections Safe? Should I Get A B12 Shot? 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 Oral vs. Intramuscular Vitamin B12 in Vitamin B12 Deficiency The Blood Project Best B12 Shots in Chicago & Naperville 2026
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