The health information posted on the Mayo Clinic website is regarded as very reliable, on par with any other medical reference text found online. The website's editing disclosure states that information is written by researchers employed by the site and then edited by medical staff at Mayo Clinic.
All articles on the Mayo Clinic website provide citations in a reference section at the end of the article. References used are always primary, peer-reviewed journal articles or reference texts, according to Mayo Clinic. The information contained in articles on the website often includes recent articles, so in addition to being well-verified, the articles are also current with literature, as of March 2015.