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The frequency of your treatments will vary depending on your reasons for taking B12 injections and your levels of B12 when you begin the treatment

10.1073/pnas.0904709106 201 VeitG.VaccarinC.LukacsG

[Abstract]2026 May 22:20:599539

beyond that trial and the halted Phase 2 lipodystrophy study, there are no completed human trials measuring body composition, strength, or long-term safety outcomes, so evidence for bodybuilding-related benefit claims remains preliminary and largely extrapolated from the hormone's known biology rather than from direct testing of CJC-1295