Yep, the Allies hatched a plan to inject estrogen into Hitler's food and turn him from a devilish fuhrer into a delicate flower. To be fair, poisoning the food of a paranoid dictator with a legion of tasters would have been a waste of some perfectly good cyanide, plus quite a few Allied leaders thought that whacking Adolf would actually help the Germans, since his "strategic blundering made him more of an asset to the Allies alive than dead." And so the British and American agencies settled for a substance that wouldn't be detected right away, but would have devastating long-term effects: namely, female sex hormones. The idea was to make Hitler less aggressive and more like his timid younger sister Paula, because this was the 1940s: before we'd really cornered the market on genetics, but well after we'd mastered misogyny.
According to their intelligence, Hitler's sexual alignment was already pretty dubious, so the Allies felt he just needed a gentle nudge to embrace full womanhood. As an added bonus, the chemicals would cause Hitler's hair to fall out and make his voice go all high-pitched and feminine, thereby ruining all of his dramatic, screamo speeches.
Â German Federal Archive
His 'stache would vanish, rendering him cute but unrecognizable.