In a major new finding almost a decade in the making, researchers at Harvard Medical School say they’ve found a key that may unlock many of the mysteries of Alzheimer’s disease and brain aging — the humble metal lithium.

New research suggests lithium, a naturally occurring metal, may protect the brain against Alzheimer's disease and

Researchers at Harvard Medical School in Boston now say that lithium could help treat the 7 million people with Alzheimer's disease.