S-Adenosylmethionine - DenosylSD4 is recommended to improve hepatic glutathione levels to help maintain and protect liver function. - 45% of dogs and cats with liver problems have a low hepatic glutathione level. - Denosyl SD4 has been shown to increase hepatic glutathione levels in cats and dogs. - Glutathione is a potent antioxidant that protects hepatic cells.