Lithium users had 3.6 times lower chances of dying at any given age compared to users of other psychiatric medications. Not in a small trial — in a UK Biobank cohort of over half a million people.

That finding alone should have made headlines. It didn’t. Because lithium carries baggage — decades of association with heavy psychiatric dosing, toxicity monitoring, and side effects that make clinicians cautious. But the story of lithium as a longevity compound has almost nothing to do with psychiatry. It starts with drinking water.

The Drinking Water Signal

In 2011, a research team led by Kim Zarse and Michael Ristow published a study that connected two seemingly unrelated datasets. Across 18 neighboring municipalities in Japan — encompassing 1,206,174 people — they found a statistically significant inverse correlation between lithium concentrations in tap water and all-cause mortality (β = −0.661, p = 0.003).

The less lithium in the water, the more people died. The more lithium, the fewer deaths. Across all causes.

To test whether this was coincidence or biology, they exposed Caenorhabditis elegans — the roundworm that has become the workhorse of aging research — to comparable low-dose lithium concentrations. The worms lived significantly longer (p = 0.047).

This was not pharmacological lithium at psychiatric doses. This was trace lithium — the kind found naturally in groundwater, vegetables, and grains.

The UK Biobank Confirmation

In 2023, Elisa Araldi and Michael Ristow extended this work with a far larger dataset: the UK Biobank, covering 501,461 individuals, combined with NHS prescription records. Among patients with affective disorders, those treated with lithium showed dramatically lower mortality than those on other medications.

Multivariate survival analysis identified lithium as the single strongest predictor of increased survival, with a hazard ratio of 0.274 (95% CI [0.119–0.634], p = 0.0023). In plain language: lithium users had roughly 3.6 times lower probability of death at any given age compared to patients on alternative treatments.

This was not a lithium-vs-placebo comparison. It was lithium vs. other active psychiatric drugs — making the survival advantage even more striking.

The Mechanism: Why a Trace Mineral Affects Mortality

The answer centers on an enzyme called glycogen synthase kinase-3, or GSK-3.

GSK-3 is one of the most connected kinases in human biology. When overactive, it drives a cascade of pathological processes: tau hyperphosphorylation (a hallmark of Alzheimer’s), insulin resistance, chronic inflammation, and impaired autophagy — the cellular cleanup process that declines with age.

Lithium is a direct inhibitor of GSK-3. At trace doses, it doesn’t shut the enzyme down — it modulates it. This gentle inhibition produces effects across multiple organ systems:

Neuroprotection. By reducing tau phosphorylation and increasing brain-derived neurotrophic factor (BDNF), lithium supports neuronal survival and plasticity. BDNF is critical for memory formation and cognitive resilience — and its levels decline with age.

Anti-inflammation. GSK-3 inhibition dampens NF-κB signaling, one of the master switches of chronic inflammation. Given that low-grade chronic inflammation — sometimes called “inflammaging” — is now considered a primary driver of age-related disease, this mechanism alone could explain much of the mortality benefit.

Metabolic regulation. Improved insulin signaling and glucose regulation, with epidemiological links to lower rates of obesity and diabetes in populations with higher lithium in drinking water.

Autophagy promotion. Enhanced cellular cleanup — the same mechanism targeted by rapamycin, currently the most studied pharmacological geroprotector. Lithium appears to promote autophagy through both GSK-3-dependent and independent pathways, making it complementary to mTOR-targeted interventions.

The breadth of these effects explains why the mortality signal is all-cause rather than disease-specific. Lithium doesn’t fight one disease — it modulates a fundamental driver of biological aging.

The Alzheimer’s Evidence

The cognitive protection data deserves special attention. Multiple independent lines of evidence converge:

Population data. A Danish registry study of over 800,000 individuals found that lithium exposure was associated with significantly lower dementia incidence (Kessing et al., JAMA Psychiatry, 2017). A UK retrospective cohort study of 29,618 patients confirmed the association (Chen et al., PLoS Med, 2022).

Clinical trials. A Brazilian randomized controlled trial by Forlenza et al. demonstrated that low-dose lithium (300 μg/day — a fraction of psychiatric doses) stabilized cognitive decline in patients with amnestic mild cognitive impairment over 12 months, while the placebo group continued to deteriorate. A separate Brazilian trial using microdose lithium (300 μg/day) in Alzheimer’s patients showed stabilized Mini-Mental State Examination scores over 15 months (Nunes et al., 2013).

Head-to-head comparison. A 2022 network meta-analysis by Terao et al. compared lithium directly with aducanumab — the controversial Alzheimer’s drug approved despite ambiguous efficacy data, priced at $28,000 per year — and found low-dose lithium to be more effective at improving cognitive function scores.

A trace mineral available in drinking water outperformed a monoclonal antibody that took decades and billions of dollars to develop. The implications for public health are staggering — and largely ignored.

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Practical Guide: How to Increase Your Lithium Intake

This is where science meets your kitchen. Lithium is naturally present in many foods and water sources, though concentrations vary significantly by region and soil composition.

Foods Richest in Natural Lithium

Vegetables and legumes are the most reliable dietary sources. Tomatoes, potatoes, cabbage, and legumes (particularly lentils) consistently show higher lithium content in food composition analyses. Leafy greens — spinach, kale, and chard — also contribute meaningful amounts.

Grains and cereals. Whole grains retain more lithium than processed varieties. Brown rice, oats, and whole wheat are good sources, as lithium concentrates in the bran and germ layers that refining removes.

Seafood. Oily fish — sardines, mackerel, herring, and anchovies — tend to accumulate more trace minerals, including lithium, from their marine environment. Shellfish, particularly oysters and mussels, are also notable sources.

Nuts and seeds. Almonds, cashews, pistachios, and sunflower seeds provide lithium, along with other trace minerals.

Fruits. Citrus fruits (oranges, lemons, grapefruit) and bananas contain modest amounts of lithium.

Water. This is the variable most people overlook. Lithium concentrations in drinking water vary enormously by region — from near-zero to over 0.170 mg/L. Mineral waters from lithium-rich springs (historically sought out for their “healing properties” — now we may understand why) can be a meaningful source.

Supplementation: What the Evidence Supports

For those considering supplementation beyond dietary intake:

Lithium orotate is the most widely available over-the-counter form. It crosses the blood-brain barrier more efficiently than other formulations, which is why it can be effective at much lower doses. Typical supplement doses range from 1–20 mg of elemental lithium per day — orders of magnitude below the 600–1,200 mg used in psychiatric treatment.

Lithium aspartate is another supplement form, used in several of the clinical studies on cognitive function. The Forlenza trial that showed cognitive stabilization used just 300 μg (0.3 mg) per day.

Important distinctions: Lithium carbonate is the prescription psychiatric medication requiring blood monitoring and medical supervision — that is not what we’re discussing here. Lithium orotate and aspartate at low doses (1–20 mg) have shown a favorable safety profile in available research, though long-term, large-scale safety data remains limited. Trace lithium from food and water (micrograms per day) requires no monitoring and is part of normal human nutrition.

A Note on Safety

Low-dose lithium supplementation appears safe based on current evidence, but “low-dose” must be emphasized. Anyone considering lithium supplementation above trace dietary levels should consult with a physician, particularly those with thyroid conditions, kidney disease, or those taking medications that affect sodium balance. Pregnant or breastfeeding women should avoid supplementation beyond normal dietary intake.

Where Lithium Fits in the Geroprotector Landscape

Geroprotectors — substances that target the biological mechanisms of aging itself rather than individual diseases — represent a fundamental shift in how we think about health and longevity. Lithium joins a short but growing list of compounds with credible evidence for life-extending properties:

Rapamycin (mTOR inhibition) remains the gold standard, having extended lifespan in every organism tested. Metformin targets metabolic aging through AMPK activation. NAD+ precursors (NMN, NR) support cellular energy metabolism. And lithium, through GSK-3 modulation, appears to address neurodegeneration, inflammation, and metabolic dysfunction simultaneously.

What makes lithium remarkable in this group is its accessibility. Rapamycin requires a prescription and careful dosing. Metformin is prescription-only in most countries. But lithium exists naturally in your food and water — and the evidence suggests that simply living in a region with higher lithium in the water supply confers measurable longevity benefits.

This doesn’t mean lithium is a magic bullet. No single intervention is. But the convergence of population studies, animal models, randomized clinical trials, and clear mechanistic understanding makes lithium one of the most underappreciated tools in the longevity toolkit.

Closelook@Longevity is a free section of the Closelooknet newsletter. Content is produced in collaboration with a medical advisor specializing in anti-aging and preventive medicine. This article is for educational purposes and does not constitute medical advice. Always consult your physician before starting any supplementation regimen.

References

1. Zarse K, Terao T, Tian J, et al. Low-dose lithium uptake promotes longevity in humans and metazoans. European Journal of Nutrition. 2011;50(5):387-389.
2. Araldi E, Jutzeler CR, Ristow M. Lithium treatment extends human lifespan: findings from the UK Biobank. Aging. 2023;15(2):421-440.
3. Kessing LV, Gerds TA, Knudsen NN, et al. Association of Lithium in Drinking Water With the Incidence of Dementia. JAMA Psychiatry. 2017;74(10):1005-1010.
4. Chen S, Underwood BR, Jones PB, et al. Association between lithium use and the incidence of dementia and its subtypes. PLoS Med. 2022;19(3):e1003941.
5. Forlenza OV, Diniz BS, Radanovic M, et al. Disease-modifying properties of long-term lithium treatment for amnestic mild cognitive impairment. Br J Psychiatry. 2011;198(5):351-356.
6. Forlenza OV, Radanovic M, Talib LL, et al. Clinical and biological effects of long-term lithium treatment in older adults with amnestic mild cognitive impairment. Br J Psychiatry. 2019;215(5):668-674.
7. Nunes MA, Viel TA, Buck HS. Microdose lithium treatment stabilized cognitive impairment in patients with Alzheimer’s disease. Curr Alzheimer Res. 2013;10(1):104-107.
8. Terao I, Honyashiki M, Inoue T. Comparative efficacy of lithium and aducanumab for cognitive decline. Ageing Res Rev. 2022;81:101709.
9. Beurel E, Grieco SF, Jope RS. Glycogen synthase kinase-3 (GSK3): regulation, actions, and diseases. Pharmacol Ther. 2015;148:114-131.
10. Hamstra SI, Roy BD, et al. Beyond its Psychiatric Use: The Benefits of Low-dose Lithium Supplementation. Curr Neuropharmacol. 2023;21(4):891-910.
11. Szklarska D, Rzymski P. Is Lithium a Micronutrient? From Biological Activity and Epidemiological Observation to Food Fortification. Biol Trace Elem Res. 2019;189(1):18-27.
12. Matsunaga S, Kishi T, Annas P, et al. Lithium as a Treatment for Alzheimer’s Disease: A Systematic Review and Meta-Analysis. J Alzheimers Dis. 2015;48(2):403-410.

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If you read obituaries (as I do), the number of once-vigorous individuals who perish from opportunistic illnesses caused by immune senescence is startling.

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What you need to know

• Around age 60, physiological changes decimate our ability to combat infections and malignancies.

• Immune senescence is a leading cause of disability and death in aging humans.

• Nutrients that boost immune activity include zinc, DHEA, and fish oil.

• Immune imbalance occurs when our immune system fails to protect against new infections and instead generates inflammatory reactions (including increased IL-6) that attack every cell in our body.

• The herb Cistanche helps combat immune senescence, which appears to have rejuvenating effects on bone marrow.

• Supplementation with Cistanche has been shown to increase naïve T cells and natural killer (NK) cells while decreasing memory T cells and pro-inflammatory IL-6.

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