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Needle size matters because it decides which layer of tissue the B12 reaches, how comfortable the injection is, and how cleanly it goes in
Iron Infusion Many patients wait weeks for a PCP referral or insurance approval to treat low iron
Scientific References Frequently Asked Questions How long does it take to feel better after a B12 injection
R., Deng, Z
Unlike most vitamins, B12 has a uniquely complex absorption pathway: Stomach acid and pepsin release B12 from food proteins B12 binds to R-proteins (haptocorrins) in saliva and stomach Pancreatic enzymes release B12 from R-proteins in the small intestine B12 binds to intrinsic factor (produced by gastric parietal cells) The B12-intrinsic factor complex is absorbed in the terminal ileum A breakdown at any of these five steps causes deficiency which is why B12 deficiency is far more common than dietary intake alone would predict
