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Updated: Feb 5, 2026

A Cross-Disciplinary and Multi-Modal Experimental Design for Studying Near-Real-Time Authentic Examination Experiences
Published on: September 4, 2019
Close Examination of a ZYTO Electrodermal Screening System
1Stephen Barrett, MD, a retired psychiatrist who lives near Chapel Hill, North Carolina, has achieved national renown as an author, editor, and consumer advocate. In addition to heading Quackwatch.com, in 1984, he received an FDA Commissioner's Special Citation Award for Public Service in fighting nutrition quackery.
Abstract:
Electrodermal screening" ("EDS") devices are claimed to use galvanic skin responses to identify health problems and corrective actions. Thousands are being used to persuade people to buy dietary supplements, diet programs, and other offerings. This study, which involved self-testing with a leading EDS device 43 times in 10 days, found that its assessments and recommendations were preposterous and potentially dangerous. The sale and clinical use of EDS devices should be banned.
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