fda bpc-157 not approved for human use If worked as well as the internet says it does… …we'd probably have high quality trials by now. Instead we have... Lots of rat studies. Lots of podcasts. Lots of BPC-157 Legal Status: FDA Regulations
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The effect can last as long as several months, but then the pain may return

Keep it dark

The effects of a B12 shot usually last one to two weeks, but the vitamin itself can stay in your system longer

3 In B12 deficiency, methylmalonic acid (MMA) can accumulate, and it is thought that elevated MMA, alongside elevated homocysteine, contributes to damage of the myelin sheath (which protects nerve cells and speeds up nerve transmission), which can cause irreversible neurological problems
5-amino-1MQ intervention effectively removes this metabolic drain, allowing cells to maintain higher steady-state levels of both NAD+ and SAM

[DOI] [PubMed] [Google Scholar] 248.Fang H., Jin H., Wang H