Bag of blood and test vialsScientists have been running controlled anti-aging and rejuvenationtests for a century—but on rodents, not people. (Photo:Shutterstock)

In 2016, a tiny startup announced an experiment that seemedequal parts medieval sorcery and science fiction: It would injectolder people with the blood plasma of young donors in a bid toslow aging.

For three years, Ambrosia Chief Executive Officer Jesse Karmazincharged patients $8,000 to infuse one liter of plasma as part of anunorthodox, crowd-funded clinical trial. Karmazin promisedextraordinary results—going so far as to proclaim in mediainterviews that his treatment “comes pretty close” to immortality.

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