Hulda Regehr Clark

Hulda Regehr Clark (18 October 1928 in Rosthern, Saskatchewan – 3 September 2009 in Chula Vista, California) was a Canadian naturopath, author, and practitioner of alternative medicine. Clark claimed all human disease was related to parasitic infection, and also claimed to be able to cure all diseases, including cancer and HIV/AIDS, by destroying these parasites by "zapping" them with electrical devices which she marketed. Clark wrote several books describing her methods and operated clinics in the United States. Following a string of legal difficulties and actions by the Federal Trade Commission, she relocated to Tijuana, Mexico where she ran the Century Nutrition clinic.

Clark's claims and devices have been dismissed by authorities ranging from the United States Federal Trade Commission and Food and Drug Administration to alternative medicine figures such as Dr. Andrew Weil as scientifically unfounded, "bizarre", and potentially fraudulent. Clark died 3 September 2009 from blood and bone cancer.

Clark began her studies in biology at the University of Saskatchewan, Canada, where she was awarded Bachelor of Arts and Master of Arts degrees. After two years of study at McGill University, she attended the University of Minnesota studying biophysics and cell physiology. She received her doctorate degree in 1958 from the University of Minnesota. Her own biographical sketch states her degree was in physiology, but the Graduate School's Register of Ph.D. Degrees conferred by the University of Minnesota, July 1956-June 1966, states she received a Ph.D. in Zoology in 1958. Her thesis was entitled A Study of the Ion Balance of Crayfish Muscle: evidence for two compartments of cellular potassium."

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