The placebo effect can be powerful, influencing outcomes in studies using psychoactive agents.

“I have I think this has become something that has come to the public's consciousness much more I mean even the New York Times wrote a piece on this several months ago which is the power of the placebo effect and I've even spoken with pís who have run studies using psychoactive agents and you'd think how could you plus C bow your way out of that and yet they've told me that the placebo effect in terms of the post depression you would get with certain psychoactives is actually greater in the placebo group treatment group”