Winston's™ is a safe and effective pain care formula specifically made for dogs. ETArol, the freeze-dried whole extract of the New Zealand Green Lipped Mussel, is the active ingredient in a blend of nutritive herbs. Green Lipped Mussel is a valuable source of glucosamine, chondroitin and glycosaminoglycans. These natural joint health ingredients combined with omega-3 essential fatty acids already found in Green Lipped Mussel help alleviate pain and inflammation associated with normal daily activity.