My almost 9 y/o GSD has been having issues standing up, my guess is arthritis being the culprit. He gets around mostly well, can still walk and run, and he is still playful and energetic. The issue is when he gets up from laying down. His hind legs are stiff and he will limp for a few minutes. I would like to know if any of you have had experience with MSM powder/ capsules. I bought a container of Jarrow MSM powder, containing no other ingredients.