Supplement
Lithium (Low-Dose / Microdose)
Cognitive decline in mild cognitive impairment and Alzheimer's disease, on small randomized trials of low-dose lithium.
Grade C: human trials exist, but they are small, mixed or not yet repeated. This is not a finding that it does not work. How to read a grade →
Lithium in tiny doses is far less than the amount used for bipolar disorder. In small studies of people with mild memory problems or early Alzheimer's disease, low doses slowed the loss of memory and thinking. Other reports link more lithium in tap water to less dementia. Those reports show a link, not a cause. Bigger studies are still needed.
A letter describes the human evidence, not the product, the manufacturer, or the ingredient's worth.
See the full evidence record →Who responds: this record's trial reading reports no subgroup that identifies who responds.
Cognitive decline in mild cognitive impairment and Alzheimer's disease, on small trials. Drinking-water associations are observational Research that watches what people already do rather than assigning a treatment. It can show that two things travel together, not that one causes the other..
Lithium orotate and lithium aspartate are what is sold over the counter. Both cited trials used lithium carbonate. No cited trial compares the salts.
A grade describes the intervention that was tested. Where the product on the shelf differs from it, this says so.
The trial that would change this grade.
A positive trial of this shape, supported by further trials, would move this entry to B.
Why the current trials fall short
The randomized trials are small, and the drinking water findings are population associations that carry no grade. A trial large and long enough to measure conversion to dementia would test the claim directly.
Why people believe itOne human source; two published case reports of benefit; three reports of harm.
The case for low-dose lithium is that regions with more natural lithium in their drinking water have lower rates of dementia, and that lithium blocks an enzyme involved in the tangles that form in Alzheimer's disease. Small trials of low doses in people with memory decline found slower decline. Lithium orotate is sold over the counter at doses far below psychiatric ones.
What supporters point to, and what each source actually shows. None of it is enough to move this letter higher; the trial described above under Evidence wanted is what would.
- Population study, not a trialAcross Denmark, people living where drinking water had the most lithium had a lower rate of dementia than those where it had the least, but a middle level was linked to a higher rate, and the authors could not rule out other differences between places. A population study of tap water, not a trial of a supplement. PMID 28832877
A case report describes what happened to one or a few patients. It cannot show the treatment caused the change, and reports of success are published more often than reports of failure.
- A case series of low-dose lithium for agitation and psychotic symptoms in Alzheimer's disease and frontotemporal dementia. No abstract is indexed; the title reports the use. PMID 27819842
- A child with Kleine-Levin syndrome, a rare disorder of recurring episodes of excessive sleep, was managed long term with low-dose lithium. Prescription lithium, in one patient. PMID 28852256
- An 18-year-old woman who swallowed 18 tablets of a lithium orotate supplement bought online had nausea, vomiting and a tremor, and recovered. PMID 18072162
- A report of shrinkage of the cerebellum, the part of the brain that coordinates movement, after long-term low-dose lithium. No abstract is indexed; the title reports the finding. PMID 19452383
- A teenager taking low-dose lithium developed seizures for the first time after using LSD. PMID 38986146
Searched PubMed, October 2026: 11 case report record(s) returned. Three describe harm and are listed. Seven describe low prescription doses used in psychiatric or other treatment; two are listed. One describes a lithium orotate supplement mistaken in hospital for prescription lithium.
Commercial disclosure
EBL earns no commission on any supplement it grades. A purchase made through the dispensary link below pays EBL nothing, the practitioner discount goes to you in full. The dispensary is Fullscript, a practitioner dispensary, and many of the professional-grade brands in it are sold mainly through practitioners rather than in health food stores. Grades are assigned by published rubric before any commercial relationship exists and are never influenced by one. Full disclosure.
Grade C reflects limited, mixed, or single-trial human data not yet independently replicated. The biological rationale may be strong. The human evidence does not currently meet the bar for Grade B. EBL re-grades when new RCT Randomized controlled trial: people are assigned to the treatment or a comparison by chance, so the groups differ only in what they received. It is the design that can show cause and effect. evidence is published.
1 to 10 mg elemental lithium daily. FORM CAUTION: the two randomized trials on this record (Forlenza, PMID PubMed ID: the permanent number the US National Library of Medicine gives a published paper. Each one links to that paper's record on PubMed. 21525519; Nunes, PMID 22746245) used lithium CARBONATE at microdose, and the epidemiological work concerns lithium occurring naturally in drinking water. Orotate and aspartate are the common over-the-counter forms and neither appears in any cited trial. Psychiatric dosing of lithium carbonate, 600 to 1,800 mg/day, is a different thing entirely and is not interchangeable.
Lithium orotate/aspartate supplements and prescription lithium carbonate are different products and doses. Human cognitive trial evidence located for low-dose lithium used lithium carbonate, so it should not be used to validate lithium-orotate or lithium-aspartate longevity claims.
The microdose trial gave lithium once daily (PMID 22746245), and the other cited trial gave it daily (PMID 21525519). Neither summary states a time of day or whether it was taken with food.
Checked against the published summaries; the full papers could not be read. What the cited trials did, not a schedule. Every supplement, by trial timing →
How to buy this: quality criteria, not a brand
1–10mg elemental lithium/day (orotate/aspartate). This is NOT the psychiatric carbonate dose (600–1,800mg).
Lithium orotate or aspartate (OTC forms). Prescription carbonate is a different dose for a different use.
Elemental lithium mg clearly stated.
Confusing it with prescription lithium; no elemental mg listed. Starting any lithium is a decision for a physician.
The grade and these criteria are set only from human trials. Any purchase link is convenience and does not affect the grade.
Kidney disease, and any situation where fluid balance is unstable: dehydration, acute illness, low-sodium diets and heavy sweating all raise lithium levels, because the kidney handles lithium like sodium. Pregnancy and breastfeeding. Thyroid disease, since lithium is antithyroid even at low dose.
This entry has the most consequential interaction list on the site, because the drugs involved are ordinary. NSAIDs including ibuprofen and naproxen, ACE inhibitors, angiotensin receptor blockers and thiazide diuretics all reduce renal lithium clearance and raise lithium levels; these are the documented causes of elevated levels in routine practice, not exotic combinations. SSRIs and triptans add serotonergic risk. Caffeine and theophylline work the other way and lower levels. The doses sold as supplements are far below psychiatric doses, which lowers the stakes without removing them.
Ordinary drugs raise lithium levels. NSAIDs, ACE inhibitors, angiotensin receptor blockers and thiazide diuretics reduce renal lithium clearance, and these are the documented causes of elevated lithium levels in routine practice rather than rare combinations. Wilting et al. (Bipolar Disorders, 2005; PMID 15898965): drug-drug interactions as a determinant of elevated lithium serum levels in daily clinical practice. Finley et al. (Clinical Pharmacokinetics, 1995; PMID 8521679): review of the clinical relevance of drug interactions with lithium.
Monitoring rules for prescription lithium do not transfer directly to microdose lithium supplements. For lithium carbonate or other pharmacologic lithium, renal function, thyroid function and serum lithium monitoring are standard clinician-directed safety measures. If a microdose supplement is used, track the intended clinical outcome separately and recognize that efficacy and monitoring thresholds are not established for that form.
Primary evidenceSix papers, each linked to its PubMed record.
Kessing et al. (Journal of the American Medical Association Psychiatry, 2017; PMID 28832877), Fajardo et al. (2018; PMID 29103043) and Schrauzer & Shrestha (1990; PMID 1699579): population studies linking trace lithium to lower dementia/suicide. Forlenza et al. (2011; PMID 21525519) and Nunes et al. (2013 RCT; PMID 22746245; and 2007, PMID 17401045): microdose lithium RCTs in cognitive decline. Grade C.
Educational use only · Not medical advice · Starting, stopping or changing any supplement or medication is a decision for your physician
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. The grade on this page describes the strength of published human trial evidence in the populations studied. It is not a recommendation for any individual and is not medical advice. Starting, stopping or changing any supplement or medication is a decision for your physician.
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