I had some clients use peptides like TB500 and BPC157 with great success in the past but that was years ago. The problem you are going to run into now is trying to find a legitimate source of peptides. The peptide market is full of fakes. I wish I had a peptide source to recommend but I don't.
If you want to try BPC 157, most people will use a dose of 200mcg per day for 4-6 weeks. Like I said though, it's going to be a bit of a crap shoot to try to find the real thing.
I would use ostarine and a good joint supplement like N2joint rx from n2bm.com instead. Even if you could find a legitimate TB500 or BPC 157 source, I would still argue that ostarine and a good joint supplement would be even more effective. Ostarine is fantastic for healing injuries and promoting recovery, where as a good joint supplement gives your body all the building blocks it needs to actually build and repair cartilage and ligaments. It's also way cheaper then peptides (which are probably fake anyways).