ProDen PlaqueOff Powder for Cats is a patented natural feed supplement which is clinically proven to significantly reduce bad breath, plaque & tartar in cats. Like all ProDen PlaqueOff products, it's made from Ascophyllum nodosum - a select alga harvested along the North Atlantic coast. Since cats are known for having a more discerning palate, brewer's yeast is added to this product - an ingredient which most cats love. ProDen PlaqueOff Powder Cat has proven to be irresistible to a panel of cat critics. It's 100% all natural and contains no additives, artificial preservatives, gluten or sugar.