bpc-157 and tb-500 for back pain / capsules BPC-157 vs TB-500: Complete Comparison
Description
You will need a professional to guide you on administering the injection properly if you are starting this treatment

Safety profile: Adverse effects are mainly GI, mild to moderate, and transientconsistent with GLP-1 profiles and most commonly involves nausea and constipation
PMID 25327251
Pyridoxine HCl Injection can be given via intramuscular or slow intravenous injection

It differs a bit from one person to another, the effects of B12 vitamins usually last around 48 hours to 72 hours after the initial injection

This is not medical advice consult a qualified healthcare provider