In doing a bunch of research some time back, I came across two possible treatments for peyronies, and one of the places I found them mentioned was the website of the Mayo clinic in Minnesota. They are Gotu Kola and Bromelain.
Bromelain is a natural derivative of pineapple, and it helps the body digest protein. The idea is that it can help the body break up the scar tissue that causes problems. Gotu Kola is an eastern supplement, one I believe that has been used for some time. While I’ve seen claims that it can do a number of different things, I believe the use in treating peyronie’s is it helps tissues heal, connective tissue specifically.
I do not have any first hand experience with these supplements but they are being used in therapy, to what effect, I do not know. Good luck.