Hi Fng,
I have not tried Therapain but there are lots of alternative and natural supplements circulating in the world that help CP. I myself use oral, injectable and topical Homeopathics. Some work some don't.
Its a personal choice! I went to the website and the formula doesn't appear to contain anything that looks dangerous. Check with your Dr. and give it a try. You just never know, it may compliment what you are taking and help take the edge off the pain.
Good luck!
Patti