Report any signs of allergic reaction, since serious reactions have been reported with injected vitamin B12
While intramuscular (IM) injections are widely used and generally safe when performed properly, even a small error in technique, needle placement, or injection site selection can lead to significant medical complications
Key things to check: HPLC purity average 99.7% - anything materially lower may contain synthesis byproducts Mass spectrometry confirmation - verifies the expected molecular weight near 1,419 Da Amino acid analysis or sequence confirmation - supports the expected 15-amino-acid structure Endotoxin testing - relevant for sterile or injection-adjacent laboratory protocols Batch and date traceability - the COA should match the lot being studied, not a generic sample report If a supplier cannot provide a current batch COA, researchers should treat the material as unverified
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Irill et al
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