Quackwatch
Society, Issues, Health, Fraud - Quackwatch. Covers unproven and scientifically questionable claims of alternative health therapies, vitamin peddlers, and other health frauds.
https://www.quackwatch.org/
HealthWatcher.net
Society, Issues, Health, Fraud - HealthWatcher.net. Provides several recourses related to health fraud including books and articles.
http://www.healthwatcher.net