Source: The Telegraph
Agents planned to smuggle doses of oestrogen into his food to make him less aggressive and more like his docile younger sister Paula, who worked as a secretary.
Spies working for the British were close enough to Hitler to have access to his food, said Professor Brian Ford, who discovered the plot.
He explained that oestrogen was chosen because it was tasteless and would have a slow and subtle effect, meaning it would pass Hitler's food testers unnoticed.
Speaking about the scheme, Prof Ford, a science writer and fellow of Cardiff University, said: "There was an Allied plan that they would smuggle oestrogen into Hitler's food and change his sex so he would become more feminine and less aggressive."
"Their research had showed the importance of sex hormones - they were beginning to be used in sex therapy in London."
He went on: "There were agents who would be able to get it into his food - it would have been entirely possible."
Was there a sex hormone plan to feminise Hitler? Were there agents who would be able to get oestrogen into Hitler's food?