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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

[DOI] [PMC free article] [PubMed] [Google Scholar] 73.Qiao A, Liang J, Ke Y, Li C, Cui Y, Shen L, et al

If youre unsure whether a B12 shot or a B complex shot is the better choice for you, consider scheduling a consultation with a healthcare professional

Discuss this option with your healthcare team if interested

Pregnancy If you are pregnant or breastfeeding, you may not be suitable for B12 injections, but it is still safe for you and your baby if you take a limited dose of B12 orally