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Because these conditions prevent adequate oral uptake, intramuscular injection bypasses the digestive system entirely and delivers B12 directly into muscle tissue for reliable absorption

no aspiration) CDC (Subcut Injection PDF) Technique diagram and site guidance for subcutaneous injections NCBI Bookshelf Best practices for injection (asepsis, preparation, and administration) Additional Research and Background These sources provide related context and are not presented as support for a specific statement above

Severe maternal iodine deficiency has also been associated with increased incidence of miscarriage, stillbirth, and birth defects (149)

What are B12 shots (vitamin B12 injections)