Hey I'm on BPC for tendon repair. I lift 5x week and had some torn tendons from an accident. It healed my tendons and I have no nagging injuries when I am on BPC.
I take oral and nasal, which nasal can be absorbed similarly to injections. My tendons only started healing (after 5 years of PT) when I started the nasal BPC. I say this to showcase that is clearly works in my body.
However I am thinning at an increased pace. BPC does nothing to prevent this. Seemingly...maybe I would shed quicker without it but I doubt it.
I also started adding TB500 to the stack a month ago, and no better progress. Maybe if you micro needle, it could help direct bpc recovery to your follicle. Idk tho, seems tangential at best.