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A(n) placebo is an innocuous substance that has no specific physiological effect. A placebo is often used in medical research or clinical trials to test the effectiveness of a new treatment or drug by comparing it with a control group that receives the placebo. A placebo can also produce a psychological effect on the participants, such as reducing pain or improving mood, even though it has no physical effect. This is known as the placebo effect1. Some examples of placebos are sugar pills, saline injections, or consumable liquids1.
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