This document provides a summary of several authoritative and free health websites for researching and accessing health information. It begins by outlining statistics on how many Americans search for health information online and on mobile devices. It then evaluates criteria for evaluating the quality of health websites, such as who runs the site, the author's credentials, and timeliness of information. Finally, the document describes several recommended government and nonprofit websites that meet high standards for health information, including MedlinePlus, NIH Senior Health, ClinicalTrials.gov, and CDC websites.