Smart delivery systems could make noninvasive nasal routes to the brain possible

A protective layer that is extremely picky about not letting harmful substances in can sometimes also keep useful things from entering the very space it is meant to protect. The body's blood-brain barrier (BBB) is one such case. Designed to keep harmful toxins and pathogens in the bloodstream from making their way into the brain while still allowing essential nutrients to pass through, the BBB has become a formidable foe for drugs that need to be delivered to the brain.

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