Cosequin is the #1 veterinarian recommended joint health supplement brand. Cosequin Optimized with MSM is a tasty powder containing higher levels of active ingredients compared to the original researched formula, with the addition of high-quality MSM (methylsulfonylmethane). This supplement is a convenient way to provide MSM along with the scientifically researched ingredients in original Cosequin. When performance matters, choose Cosequin. *Survey conducted among equine veterinarians who recommended oral joint health supplements.