can b12 injections cause skin rash deficiency itching? – mars by GHC Vitamin B12 Injection Sites: All
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The molecule itself is old: 5-amino-1-methylquinolinium is a simple quinolinium salt, developed well before any NNMT application

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[DOI] [PubMed] [Google Scholar] Andres 2004 Andres E, Loukili NH, Noel E, Kaltenbach G, Ben Abdelgheni M, Perrin AE, et al

However, as with any supplement, it's always advisable to consult with a healthcare professional before starting any new supplement regimen
