b12 injection cause diarrhea Vitamin shots: Uses, benefits, and side effects Vitamin B12 Injections (Cyanocobalamin Injections)
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[DOI: 10.1002/14651858.ED000098] [DOI] [PMC free article] [PubMed] Schnemann 2011 Schnemann HJ, Oxman AD, Higgins JPT, Vist GE, Glasziou P, Guyatt GH

The peptide incorporates an additional tyrosine residue at its N-terminus, which researchers believe contributes to its stability in laboratory settings
People feel miserable and come in, they get a shot, and they feel fantastic for the next several weeks

Degraded medication may be ineffective or produce harmful byproducts