Glucosamine and chondroitin---with MSM or not?

Aloha to everyone from a new member. I recently went to buy glucosamine and chondroitin for joint health, and found that if you get it with MSM it costs a lot more. (It already costs a lot even without the MSM.) Does anybody out there know what the advantages are of having MSM in the mix? Thanks from Sue. And greetings to all you other new members out there!