Adolf Hitler most likely suffered from the genetic condition Kallmann Syndrome that can manifest itself in undescended testicles and a micropenis, researchers and documentary makers said Thursday, following DNA testing of the Nazi dictator's blood.

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The findings by an international team of scientists and historians now appear to confirm longstanding suspicions around his sexual development.

"No one has ever really been able to explain why Hitler was so uncomfortable around women throughout his life, or why he probably never entered into intimate relations with women," said Alex Kay of the University of Potsdam.

"But now we know that he had Kallmann Syndrome, this could be the answer we've been looking for," he said.

The research findings are featured in a new documentary, "Hitler's DNA: Blueprint of a Dictator," due to be broadcast on Saturday.

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