As Chris mentioned, Curcumin (the active ingredient in turmeric) is helpful. The trick with Curcumin is not much is bio-available. There is one supplement maker, Solgar, who has come up with a way to make it water soluble and that helps. Theirs is probably the most effective supplement. Of course you can buy turmeric root and juice it if you have a masticating juicer. But most of us don't.
Glucosamine and Chondroitin helps too. Also, bone broth or gelatin. The amino acids help the inflamed tissue. Take Vitamin C with it as it helps with bio-availability. Some I know have had great success with acupuncture. Magnesium soaks can be helpful also.
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