Recent research shows that blood from young mice fixes the brain in older mice. 

Researchers found that older mice, when given transfusion of blood from young mice, reverses age-related impairments in cognitive function and synaptic plasticity in mice.

Exposure of an aged animal to young blood suggest therefore that it counteract and reverse pre-existing effects of brain aging at the molecular, structural, functional and cognitive level.

Would this also work for humans? No research is still done, but it is on the planning.

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