In crushed gastrocnemius muscle studies, BPC-157 administered either intraperitoneally or locally as a topical cream improved muscle healing macroscopically (reduced hematoma and edema, prevention of post-injury leg contracture), microscopically, and functionally
Tirzepatide is a large protein molecule
That said, like any supplement, vitamin B12 injections are not for everyone
From there, vitamin B12 combines with a protein called intrinsic factor so that it can be absorbed further down in the small intestine
Also look for a company which sells "prescription-grade" vitamin B12, and any other supplements they sell on the site
Independent third-party testing via mass spectrometry and HPLC analysis is the only way to confirm what is actually in a vial