In combination, the ginkgo biloba experiment and the hotel experiment demonstrated that:

They both demonstrated that: people's beliefs and expectations can have a significant influence on behavior and well-being

In both of those experiments, the subjects were divided in to two groups, and all of the subjects were told to consume or do certain things.

The first group was told that consuming or doing certain things would extremely beneficial for their health; While the other was told nothing.

The experiment showed that the group that receives the additional information showed a positive effect in their health.