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Periwinkle is originally from Europe used to treat nervous disorders, epilepsy, hysteria, and nightmares. Research has shown that vinpocetine, a natural component of periwinkle, helps transport oxygen and glucose to the brain. It is a vasodilator and cerebral metabolic enhancer. ("The Brainwash" by Michelle Cook pg147). Doctors in Hungary have used the herbal form of periwinkle to treat senility and blood vessel disorders in the brain. It can boost cognition and menory in healthy people too.