Possible Clues:

• Improvement that may be based on psychology instead of medicine
• Consequence of taking useless drugs in The Trial? As a phenomenon, it only profits the sugar producers presumably!
• I imply nothing will get you healthy again
• Repercussion of taking pointless drugs? As a result of the trial, there's nothing in it!
• Position box office to have an impact on positive reaction to useless type in The Trial
• A demonstration that nothing can cure you?
• Drug trial phenomenon (substitution for E)
• Recognise darling, it¿s said, has impact to do with influence of snake oil perhaps
• Response to snake oil, perhaps
• Response to sugar pills, perhaps