The vet said the x-rays confirmed arthritis in our 10 year old cat. She was limping and acting different; isolating herself. The vet prescribed her some pain medicine and while waiting for it I put a good pinch of MSM powder in her wet food one evening. The next morning, I found her toys strewn throughout the hallway. Something she had not done since the onset of the limp. The limp was only noticeable if you looked for it. We continued the pinch of MSM plus a pinch of Vitamin C powder. After a few days, she was zipping and jumping around like her old self. Absolutely no signs of discomfort from the arthritis. Never even picked up the pain meds. Truly amazing.