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The US Centers for Disease Control and Prevention's Vaccines and Immunizations Glossary defines a '''placebo''' as "A substance or treatment that has no effect on human beings." <ref>US Centers for Disease Control and Prevention, Vaccines and Immunizations Glossary, entry for "placebo" [http://www.cdc.gov/vaccines/about/terms/glossary.htm#p]</ref>
A '''placebo''' is a [[substance]] or [[treatment]] used as a decoy in studies for the "control" part of the sample. Part of the study group will receive a placebo, and the remainder the group will receive the new [[medication]] being studied, so that the differences in outcome may be compared.
A '''placebo''' is a [[substance]] or [[treatment]] used as a decoy in studies for the "control" part of the sample. Part of the study group will receive a placebo, and the remainder the group will receive the new [[medication]] being studied, so that the differences in outcome may be compared.