At regular strength, this drug is used to help drug addicts recover by blocking their ability to get a high. At low doses, it has received significant attention as miracle therapy for Multiple Sclerosis (go search for "low dose naltrexone" on youtube and you'll see what I mean). It also addresses other immune disorders such as Crohn's and Lupus. Finally, it has also gotten press on it's ability to boost the cancer patient's immune systems. It's cheap and apparently has little to zero toxicity and side-effects.