Glucosamine, Chondroitin & MSM are three of the most popular and effective nutrients for supporting joint health in dietary supplements. Glucosamine and Chondroitin in the sulfate form are the most studied form of these nutrients.

MSM (methylsulphonylmethane) is an organic form of sulfur found in all living organisms. Studies have shown that these nutrients provide dietary components that support healthy joint structure and function.

Articles:

http://en.wikipedia.org/wiki/Glucosamine

http://en.wikipedia.org/wiki/Chondroitin_sulfate

http://en.wikipedia.org/wiki/Methylsulfonylmethane