Any perceived benefit is likely due to concurrent lifestyle changes rather than B12 itself
Research context: For evidence on mechanisms, human and preclinical research, limitations, and safety, read KPV Peptide: Benefits, Uses, Side Effects, Dosage, and Research
When it comes to supplements, taking high doses of vitamin C at the same time as your B12 shot might slightly lower the amount of B12 your body can use, but this is more relevant for oral B12 supplements than injections
AOD-9604 has a comparatively limited safety database, which is its own problem
Copper is an essential trace element involved in normal biological processes, and peptides are used in cosmetic systems as delivery and signaling components
However, you dont need to visit a separate doctor first