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Never self-prescribe iron supplements excessive iron can be harmful

Both can raise B12 levels effectively, but they behave differently once injected

[DOI] [PubMed] [Google Scholar] [156].Cao M, Mu X, Jiang C, Yang G, Chen H, Xue W, Single-nucleotide polymorphisms of GPX1 and MnSOD and susceptibility to bladder cancer: a systematic review and meta-analysis

Specific clinical scenarios where injections are the standard of care include pernicious anemia, severe malabsorption syndromes, post-bariatric surgery when oral supplementation has failed, and critically low serum B12 levels accompanied by neurological deterioration