What the Lithium Research Actually Shows

You may have seen headlines this year about lithium and Alzheimer's disease. Seems really exciting. Even Tucker Carlson is talking about it.I hope it leads to improving people’s lives.

Yet like so much other scientific research, you have to dive into the details to see what’s really going on.

In August 2025, a team at Harvard led by Dr. Bruce Yankner published a study in the journal Nature looking at lithium — yes, the same element used in mood-stabilizing medication — and its role in brain aging.

They discovered that the brain naturally produces and uses small amounts of lithium, and that people with mild cognitive impairment or Alzheimer's had significantly lower lithium levels in the prefrontal cortex, the brain region responsible for memory and decision-making.

Even more interesting: the sticky amyloid plaques associated with Alzheimer's appear to trap and "soak up" this natural lithium, starving nearby brain cells of it. When researchers gave a specific lithium compound (lithium orotate) to mice bred to develop Alzheimer's-like disease, it reduced plaque buildup, calmed inflammation, and in some cases restored memory performance.

Which apparently caused a run on Lithium supplements across the country.

It's worth understanding the layers here, because they carry very different weight:

• The lithium-deficiency findings came from analyzing donated human brain tissue after death, comparing metal levels across people with no impairment, mild impairment, and Alzheimer's.

• The reversal of memory loss came from live mice, not humans — a common and useful first step, but mouse biology doesn't always translate directly to people.

• Separately, a small human trial called LATTICE has been testing low-dose lithium in people with mild cognitive impairment, but it's a "pilot feasibility" study — meaning its main job was to test whether a larger trial is even practical, not to prove lithium works.

No large, completed human clinical trial has yet shown that lithium supplements prevent or reverse Alzheimer's in people. Mouse studies frequently look promising and don't pan out in humans.

Lithium also isn't harmless — even at low doses, it can affect kidney and thyroid function, and prescription-strength lithium requires blood monitoring.

Several researchers who reviewed the study publicly cautioned that we should wait for controlled human trials before drawing conclusions about supplementation. I agree with them.

While this research is genuinely exciting, the most reliable, well-established tools we have for lowering dementia risk today are still lifestyle-based:

• Regular physical exercise

• Quality sleep

• A low-carb, sugar-free diet

• Staying socially and mentally engaged, and

• Avoiding smoking and excess alcohol.

Large long-term studies (and my personal experience in my assisted living homes) consistently link these habits to meaningfully lower dementia risk — evidence that's far more mature than anything we have on lithium supplementation so far.

Lithium's connection to brain health is a genuinely promising research direction, worth watching closely over the next few years. But it's not yet a proven treatment, and it's not a substitute for the daily habits we already know protect your brain. If you're considering any supplement — lithium or otherwise — talk with your doctor first, especially given the monitoring lithium requires.

Hopefully I will have more exciting news about breakthroughs in the future. In the meantime, take care of yourself.