It's well-proven in mice but the quantities of blood needed are gargantuan and make a transfusion-based approach extremely difficult. The most effective mouse m

It's well-proven in mice but the quantities of blood needed are gargantuan and make a transfusion-based approach extremely difficult. The most effective mouse models have used parabiosis -- not a palatable or moral technique for humans. However, there's ongoing research to isolate and synthesize the chemical factors responsible for the effect -- which may provide a viable therapy. (Source: my girlfriend worked in a lab studying young blood.)