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b12 injections how long does it take to work for Vitamin Work? How Long Does Vitamin B12
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Shibata et al., 1988

If your doctor recommends a B12 shot during an outpatient visit , Medicare Part B may cover your expenses

Dosing typically ranges from 500-1000 mcg daily in oral form, or 1000 mcg monthly via intramuscular injection for those with absorption issues

Nicotinamide N-methyltransferase (NNMT) in health and disease. Cellular and Molecular Life Sciences, 78, 62416257