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has no direct physical effect on human beings
A placebo is a substance or treatment that has no effect on human beings, but is used as a decoy in studies for the "control" part of the sample. In other words, 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.<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#p</ref>
A '''placebo''' is a [[substance]] or [[treatment]] that has no direct physical effect on [[human being]]s, but is used as a decoy in studies for the "control" part of the sample. In other words, 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. <ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#p</ref>
==References==
==References==