S-ADENOSYLMETHIONINE Chewable tablets.  Each Zentonil® Plus 200 tablet contains 200 mg of a stable salt of S-adenosylmethionine (SAMe). To support liver function.  S-adenosylmethionine increases hepatic levels of glutathione - an important antioxidant that protects hepatic cells. It may also promote hepatocellular regeneration.