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Who We Are Patient Resources Become a Patient Services Therapies Education Research Our Lab Locations Contact 2014 Riordan Clinic All Rights Reserved Welcome To The Riordan Clinic. Riordan Clinic is a worldrenowned academic medical center that has led the world in integrative oncology and complex chronic illness care since 1975. For more than 47 years people have turned to the Riordan Clinic to restore improve and maintain health. We continue to specialize in nutritional testing and holisticnaturopathic treatments for sustained illnesses such as cancer Lyme disease gut issues anxiety and depression autoimmune disorders diabetes and more.