It may sound like a gruesome technique used by a vampire1 to get his daily fix.

这也许听上去就像是吸血鬼用的恐怖方法，靠每日吸血来维持日常状态。

But top executives in Silicon2 Valley are turning to blood from young people in the search for the ‘biological fountain of youth.’

Early studies have suggested that the parabiosis procedure, which involves the transfusion3 of blood plasma4 from a young donor5, can have age-reversing effects on the body – but it will cost you $8,000.

Scientists first experimented with parabiosis in the 1950s, and in recent years, it’s begun to gain attention once again.

In the organ systems of both animals and humans, the procedure has been found to reverse the symptoms of aging.

But scientists don’t yet understand all of the mechanisms6 at work.

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