Pure Msm, Does it work well?

I use it on my older Percheron...when cold weather hits, he gets down and hurts so bad with arthritis that he can't get up without pain meds and physical help. When I started him on MSN, glucosomine and Lixitnic (sp?), he became a new horse...now he goes out and rolls, even makes it all the way over sometimes, gets up and shakes himself off...an when hitched to the carriage, I have to keep slowing him down...does that little rolling walk/trot that hitch horses do...so yes, I really endorse it...do some research the web and figure up according to the age and weight of your horse and start him out slow, then build him up to a maintenance level...uh, got to warn you, it produces lots of flatulence...get ready for it. It also comes in liquid form, making it easier to incorporate into the feed, less wastage by sifting down to the bottom of the feed.