A well-controlled clinical trial is much like a well controlled experiment. They are both rooted in the cornerstone of the scientific method. What exactly is a clinical trial? According to clinicaltrials.gov, “In a clinical trial (also called an interventional study), participants receive specific interventions according to the research plan or protocol created by the investigators. These interventions may be medical products, such as drugs or devices; procedures; or changes to participants' behavior, for example, diet.”  In the 21 CFR 314.126, the FDA lays out regulations as to what makes an “Adequate and Well-Controlled study” as one that has: