can you take b12 tablets with b12 injections Feeling worse after Injection: Answering concerns B12 Injections vs Pills: Richmond's

Transcobalamin derived from bovine milk stimulates apical uptake of vitamin B12 into human intestinal epithelial cells

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

Low potassium levels, which can lead to constipation, an irregular heartbeat, leg cramps, numbness or tingling

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[9] High-dose niacin (used to treat cholesterol) lacks human safety data in pregnancy and could theoretically affect the fetus (for example, by causing hypotension or altering lipid metabolism)