The Secret Ingredient in Young Blood: Oxytocin?

Last month, I wrote in the New York Times about a creepy yet potent way to reverse aging. All you have to do is join an old mouse to a young mouse. As the young mouse's blood flows through the old mouse's body, it rejuvenates the heart, skeletal muscle, and even the brain.

When scientists saw just how dramatic this reversal could be, they started investigating how it happens. They suspected that it wasn't blood as a whole that was responsible for the transformation. Blood is a finely blended consommé of cells and free-floating molecules. It was possible that only certain compounds in young blood are required to ...

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