Researchers are conducting a study to determine the effects of vitamin C on the human immune system. The study involves providing pills that contain vitamin C to one group of human subjects and pills that do not contain vitamin C or other active ingredients to another group of people. The pills that do not contain the vitamin are

Question

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The pills that do not contain vitamin C or other active ingredients are placebos, which are used as a control in the study. Placebos are used to ensure that any observed effects are truly due to the vitamin C and not a result of other factors such as the placebo effect.

Researchers Are Conducting a Study to Determine the Effects of Vitamin