Naltrexone is an opiate antagonist drug developed in the 1970s and approved by the FDA in 1984 for opiate and drug abuse treatment. When used at much lower doses in an off-label protocol referred to as low dose naltrexone (LDN), the drug has been shown to halt disease progression in Crohn's disease and certain cancers, to reduce symptoms in multiple sclerosis and autism, and to improve numerous autoimmune and neurodegenerative conditions, including...