However, the B12 itself can stay in your system longer, with effects on red blood cell production and nerve health lasting for weeks or months, depending on your deficiency and injection frequency
How Long Do the Benefits of a B12 Shot Last
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A B12 shot is a quick intramuscular injection of vitamin B12 (cobalamin) that bypasses the stomach acid, liver metabolism, and intestinal absorption issues that limit oral B12 to roughly 1% bioavailability in most adults
Both units are used, but mcg is more common for B12 doses, mainly for smaller amounts