With such a topic so broad we truly try to cover the basics from all angles in this group. Nothing too big or too small. Nutrition is as significant if not more as exercise is to reaching your goals so learn all you can.
Glucosamine/Chondroiton is one with MSM is an added bonus. Celadrin is also an option, and you can get it with MSM also. Add fish oil to the mix, preferrably in as high as a 6:1 EPA:DHA ratio if you can find it.