Did not really came across anything in regards BPC, TB only in high doses and long term. The studies kinda remind me of Cardarine, some suggest it causes cancer some suggest its good against cancer.
As long as you dont overdo it with TB and run extraordinary doses like +20mg a day and still do some bloodwork just to monitor things it should be fine.
I have only seen 2 cases myself where someone had a crazy high red blood cell count after high-dose TB as part of an injury protocol. Seems extremely rare but still to be on the lookout for. (Both used more 5mg TB daily over a 3 month period)
Polycythaemia vera caused by TB was then treated with medication to slow down the red blood cell production.
Bodybuilders tend to just donate blood for that but in the long run that depletes your Iron levels and when you are on a GLP it makes it even more difficult for the body to absorb iron creating a devils cycle