I just think that is always in my mind of like, Is this safe for someone to do, and is this going to have any long-term effects? To Lennys point, theres one study in PFJ, like 7 of 12 patients reported subjective improvement in 6 months
When you have acne, your skin gets inflamed, which damages your skin cells and breaks down collagen

It includes 1-5 intramuscular or subcutaneous injections of 1000 mcg crystalline cyanocobalamin daily, followed by oral doses of 1000-2000 mcg/day Parenteral administration should be reserved for those with significant neurological symptoms NICE guideline: Vitamin B 12 deficiency in over 16s: diagnosis and management: Malabsorption as the confirmed or suspected cause of vitamin B 12 deficiency: Offer replacement to people if: lifelong intramuscular vitamin B12 Autoimmune gastritis is the cause They have had a total gastrectomy They have had a complete terminal ileal resection If the person has a vitamin B 12 deficiency because of malabsorption that is not caused by autoimmune gastritis, or a total gastrectomy or complete terminal ileal resection (for example, malabsorption caused by coeliac disease, partial gastrectomy or some forms of bariatric surgery): Offer vitamin B 12 replacement and Consider intramuscular instead of

Research demonstrates that BPC-157 upregulates vascular endothelial growth factor receptor-2 (VEGFR2) at both mRNA and protein levels in endothelial cells without increasing VEGF-A itself, instead sensitizing cells to existing VEGF signaling while simultaneously activating the Src-Caveolin-1-endothelial nitric oxide synthase (eNOS) pathway
Risk factors for gout and prevention: a systematic review of the literature