Although peer reviewed papers may turn out to be flawed, or may have conflicting results, they contribute to the formation of a body of reputable evidence on a topic. The process of peer review is designed to, hopefully, ensure a minimum level of quality in the papers that get published.
Many snake-oil, or scam, disease cures make outlandish claims without data to support them. It is important to remember that anyone can make up statistics on a website, post false testimonials, or even publish a book that says anything they want it to. It is generally not the best idea to give a lot of weight to medical claims that are published without peer review or some other established fact-checking process.
The peer review process is not perfect, and bad or even fraudulent research has occasionally made it into print. However, using peer-reviewed papers to check medical claims is a good first line of defense against drug peddling con artists whose only concern is your pocketbook... not your health.

