MSM or Methylsulfonylmethane is found naturally in some raw fruits
and vegetables. It a sulfur containing compound, and it is
essential for normal cell function. MSM decreases inflammation and
pain, and acts as an antioxidant.

HOW it works for arthritis

It replenishes sulfur stores within arthritic joints, allowing
cartilage to rebuild.

There is also evidence suggesting that it increases the
effectiveness of glucosamine.

Should you use it?

In supplementing for arthritis, different animals respond to the
variety of supplements.

Some ONLY need Glucosamine, while others respond much BETTER to
combinations of supplements.

In treating dogs and cats for arthritis, I have had the best success in supplementing with Glucosamine, Chondroitin AND MSM.