I'm searching for a way to identify which particular protein/molecule in beef collagen triggers my reactive arthritis. After getting baselined, I found a lot of improvement with glycine. As glycine is one of the major building blocks of collagen (mine is visibly impaired), I tried beef collagen, which triggers my reactive arthritis. I'm searching for a way to identify which particular beef collagen protein/molecule could be triggering my RA. I used bulletproof brand, which is pure beef collagen. I will try other sources (chicken, fish) but not until this current inflammation cycle abates. Does anyone have any ideas?