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MARTHA L. GAY and KEVIN D. WHITE U.S. Food and Drug Administration, Center for Food Safety and Applied Nutrition, Washington, DC 20204 WILLIAM R. OBERMEYER ConsumerLab.com, 1234 Rock Hill Rd, Pasadena, MD 21122 JOSEPHM. BETZ American Herbal Products Association, 8484 Georgia Ave, Suite 370, Silver Spring, MD STEVEN M. M USSER U.S. Food and Drug Administration, Center for Food Safety and Applied Nutrition, Washington, DC 20204

Determination of Ephedrine-Type Alkaloids in Dietary Supplements by LC/MS Using a Stable-Isotope Labeled Internal Standard