For arthritis:
chondroitin made from bovine (not shark cartiledge), glucosamine (although I've tried it without much success), fish oil, vit E and MSM.
Many people I know use (as do I), Joint Health from Springtime Inc. and Fresh Factors. My current seniors get 3 Joint Health in the morning and 2 Fresh Factors in the evening along with fish oil, and vitamin E.
In the advanced aged seniors, I've used 8 Fresh Factors a day along with MSM, fish oil and vitamin E. There are also chinese herbs, both for inflammation and pain (long term and short term)
I am fortunate to have vets that come to the house for chiropractic and acupuncture. Chiropractic really helps. Once my chiropractic vet gets her rehab facility done, I'll have to take them there. I'm glad it's about 15-20 minutes down the road!
Arthritis is one area that Eastern medicine and alternative medicine really helps.