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You can give yourself a B12 shot using either IM or SQ delivery

Patients with Fitzpatrick IV-VI skin should be monitored for potential irritation during initial use, particularly in combination with other actives, and formulations should be pH-controlled (pH 3.5 or lower for efficacy without excessive irritation)

When taken as recommended, this vitamin B12 supplement is generally safe for daily use

[DOI] [PMC free article] [PubMed] [Google Scholar] Du X, Matsumura T, Edelstein D, Rossetti L, Zsengellr Z, Szab C, Brownlee M

EU Register of Authorised Health Claims Regulation (EC) No 1924/2006