Taking the magic mushroom drug psylocibin for a trial
Dr Michael Mosley experiences taking psylocibin, a Class A drug found in magic mushrooms, as part of a clinical trial.
The former government drugs adviser Professor Nutt is leading research into its potential in the treatment of depression and trauma.
The NHS offers advice against the misuse of hallucinogens and other illegal drugs because of the potential risks of psychological or physical harm.
Michael Mosley presents The Brain: A Secret History, a three part series on BBC Four on Thursdays at 2100GMT from 6 January.