Scientists just used a lithium compound to reverse Alzheimer’s.
Harvard researchers have identified lithium depletion as a primary driver of Alzheimer’s, paving the way for low-dose treatments that could potentially reverse memory loss.
For decades, scientists have searched for the precise trigger that turns brain abnormalities into the devastating cognitive decline of Alzheimer’s disease. New research from Harvard Medical School suggests the answer lies in lithium, a naturally occurring element in the brain that maintains cell function and shields against aging. The study reveals that as toxic amyloid plaques begin to form, they bind to and deplete the brain’s natural lithium stores. This discovery finally explains why some individuals with brain plaques never develop dementia—their lithium levels may remain high enough to provide ongoing neuroprotection despite the presence of disease markers.
To address this deficiency, the research team identified a specific compound called lithium orotate that evades capture by amyloid plaques. In mouse models, this treatment successfully reversed Alzheimer’s pathology and restored memory using doses 1,000 times lower than those typically used for psychiatric disorders, effectively bypassing the toxicity issues that have historically limited lithium's use in the elderly. While human clinical trials are the next essential step, the findings suggest that routine lithium screening could one day allow for early intervention, offering a fundamental new strategy to prevent or even reverse the march of memory loss.
source: Dutchen, S. (2025). Could Lithium Explain — and Treat — Alzheimer’s Disease? Harvard Medical School News.