Summary
Tyler Andrews and pharmacist Joe DiMatteo Jr. break down a 2025 Nature study revealing that lithium levels are significantly depleted in the brains of people with Alzheimer's disease. The study found that while serum lithium appeared normal in all groups, brain lithium was specifically reduced in those with mild cognitive impairment and Alzheimer's, with amyloid plaques appearing to absorb and trap the mineral. The team discusses mouse model experiments showing that removing lithium from healthy mice diets triggered amyloid plaque formation, tau phosphorylation, neuroinflammation, and measurable memory impairment. Critically, the researchers found that lithium orotate — unlike lithium carbonate — was less likely to be absorbed by amyloid plaques and could reverse brain damage and restore memory in affected mice. They also reference population-level drinking water studies linking higher lithium levels to lower dementia rates across multiple countries.
Key Points
- A 2025 Nature study measured 27 metals in post-mortem brains and found lithium was the only one significantly lower in Alzheimer's and mild cognitive impairment
- Serum lithium levels showed no difference between groups — the deficiency is specific to brain tissue
- Amyloid plaques appear to concentrate and trap lithium, depleting it from surrounding healthy brain tissue
- Removing lithium from healthy mice diets caused increased amyloid plaque, tau phosphorylation, neuroinflammation, and memory impairment
- Lithium orotate was less likely to be absorbed by plaques than lithium carbonate, making it more bioavailable to healthy brain cells
- Mouse models showed lithium orotate reduced amyloid plaques, lowered neuroinflammation, and restored synapses and memory performance
- Regions with higher lithium in drinking water consistently show lower dementia rates across multiple populations
Key Moments
Brain lithium deficiency found in Alzheimer's patients
The hosts discuss findings that lithium was the only metal significantly lower in brains with cognitive decline and Alzheimer's, despite normal serum levels, with amyloid plaques concentrating and trapping lithium from surrounding tissue.
"Lithium was the only metal that showed significantly lower levels in those with cognitive decline and Alzheimer's across both core cohorts"
Lithium orotate reverses Alzheimer's markers in mice
Joe explains that lithium orotate, unlike lithium carbonate, is less ionized and therefore less likely to be absorbed by amyloid plaques. In mouse models, lithium orotate reduced amyloid plaque, lowered neuroinflammation, restored synapses and myelin, and improved memory performance.
"lithium orotate. So it's a different salt of lithium is much less ionized. And they found that there was less brain penetration and less likelihood for the amyloid plaques to absorb it"
Drinking water lithium linked to lower dementia rates
The discussion covers population studies showing regions with higher lithium in groundwater had consistently lower dementia and Alzheimer's rates across multiple populations, reinforcing the potential neuroprotective role of trace lithium.
"in their groundwater, had consistently lower dementia rates. No kidding. Yes. Mid-range water, mid-range amount of lithium in the water had lower Alzheimer's risk. So not of impairment of any kind cognitively, but lower actual full-blown Alzheimer's disease risk. Multiple populations showed the same trend. That's fantastic. Yeah, because a lot of what we see even with lithium orotate, and we actually don't carry it,"
