More severe reactions could include difficulty breathing, swelling of the face, lips, tongue, or throat, which would require immediate emergency medical treatment
[DOI] [PMC free article] [PubMed] [Google Scholar] Garamella J
[23] Antivitamin B 12 compounds (often synthetic B 12 analogues) not only have no vitamin action, but also actively interfere with the activity of true vitamin B 12

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Growth hormone peptides carry a theoretical risk: Peptides like sermorelin and ipamorelin raise IGF-1, which is a genuine growth driver