Harvard Researchers Discover a Surprising Link Between Lithium and Alzheimer’s Disease: Could It Help Protect the Brain?

The Harvard-led lithium study offers a fascinating new perspective on Alzheimer’s disease.

Researchers found lower lithium levels in certain brain regions of people with mild cognitive impairment and Alzheimer’s disease. They also found evidence that amyloid plaques may trap lithium, reducing its availability to surrounding brain tissue.

In mouse models, lithium depletion worsened several Alzheimer’s-related changes, while treatment with lithium orotate reduced pathological changes and improved memory performance, including in animals with advanced disease-like pathology.

These results provide a strong reason to investigate lithium biology further.

However, the evidence does not show that lithium orotate reverses Alzheimer’s disease in humans, and it does not establish that taking lithium supplements is safe or effective for preventing dementia.

The next essential step is carefully controlled clinical research.

For now, the most accurate interpretation is that scientists have identified a promising potential mechanism and treatment strategy that still needs to be tested in people.

The discovery may eventually contribute to better ways of understanding, preventing, or treating Alzheimer’s disease. Until human trials establish the benefits and risks, caution remains essential—and no one should use lithium supplements as a substitute for professional medical care.