Hi, ! It can be hard to find definitive studies on the efficacy of chondrotin and glucosamine for managing RA symptoms. And, while this article is slightly off topic from your question, I wanted to share this piece from one of our contributors on her use of bone broth to help with her RA symptoms -- https://rheumatoidarthritis.net/living/bone-broth.
Also, if you haven't done so already, you can discuss Osteo Biflex with your physician. Some physicians do feel comfortable recommending supplements like this one to help with joint health, but you may want to check with your personal physician, to be safe.
I hope this helps and I do hope you get some feedback from other community members that may be taking this supplement or a similar one.
Best, Erin, RheumatoidArthritis.net Team member.