How physician Alexander Bogdanov stopped balding

In 1924, Bogdanov started his blood transfusion experiments, apparently hoping to achieve eternal youth or at least partial rejuvenation. Lenin's sister Maria Ulyanova was among many who volunteered to take part in Bogdanov's experiments. After undergoing 11 blood transfusions, he remarked with satisfaction the improvement of his eyesight, suspension of balding, and other positive symptoms. His fellow revolutionary Leonid Krasin wrote to his wife that "Bogdanov seems to have become 7, no, 10 years younger after the operation".