http://www.fda.gov/oc/opacom/evalhealthinfo.html
U.S. Food and Drug Administration
Millions of consumers are using the Internet to get health information. And thousands of Web sites are offering health information. Some of those sites are reliable and up-to-date; some are not. This document provides questions and answers that can help you determine whether the health information you find on the Internet or receive by e-mail from a Web site is likely to be reliable.