Meet the Doctor Who Sells Blood Plasma From Teens

If you give a mouse a cookie, he's going to ask for a glass of milk. But if you give a mouse a transfusion of blood plasma from a much younger mouse, you can improve his cognitive and neurological functions—and reverse the effects of aging.

The scientific studies are fairly remarkable. In 2014, researchers at Stanford University demonstrated that infusion of young blood plasma in mice "is capable of rejuvenating synaptic plasticity and improving cognitive function." In other words, blood helps keep mice young.

Can this work on humans, too? Jesse Karmazin, a 32-year-old physician and graduate of Stanford University’s medical school, says yes. Karmazin is the founder of Ambrosia LLC, a company that is charging adults $8,000 to be injected with blood plasma from young people (ages 16-25). It's part of a clinical trial to test the anti-aging benefits of plasma transfusions. The trial passed ethical review, but you have to be 35 or older (and, well, able to scrounge up $8,000) to participate.

And, Karmazin insists,—the story of a man who ages in reverse.