In 2007, the American Journal of Gastroenterology published a study showing that low doses of naltrexone, marketed as Revia, significantly improved the health of Crohn's disease patients.
On his Eating SCD blog, Paul Stocker noted some of naltrexone's other effects . . . (read on)
In addition, naltrexone is used to treat pathological gambling and heroin addiction.
Note: The FDA has given Naltrexone a black box warning for potential liver toxicity.