The Placebo Effect
The Placebo Effect is used in science for multiple different things. Placebos were given to people for a variety of mental disorders or sicknesses. They are if you did not know already, harmless. Placebos tend to be sugar pills but can be made out of some other things too. In any case, for those who thought they had a problem they did not, this was a great way of testing it. At the time time, it could also be used for drug trials where you have a “control” group.
This group is told they are given the medication (a Placebo) when they are not while the other half are actually given the drug. No one knows who will have the Placebo ahead of time, except those running the trial. In spite of the fact that people are not given the real drug, some will return and report success on the Placebo. When in reality, it would have offered them no assistance.