Lithium orotate vs Magnesium L-Threonate
Two minerals sold in a special salt for the brain. In both cases the salt is the marketing and the evidence sits somewhere else.
Short answer
Magnesium L-threonate rests on firmer ground than lithium orotate, with human clinical data against only preclinical or minimal evidence, resting mostly on animal or lab work. Someone focused on memory and brain magnesium has trial data to go on with magnesium L-threonate; lithium orotate, marketed for mood, cognition and neuroprotection, is still an early-research option.
Lithium orotate
The intriguing signal is epidemiological — regions with higher lithium in drinking water show lower suicide rates — at doses far below prescription lithium; no RCT has tested the low-dose orotate salt actually sold as a supplement.
Full Lithium orotate evidence reviewMagnesium L-Threonate
Magtein
The 'raises brain magnesium and memory' story rests on one 2010 rat study plus one small industry-linked human trial; for repletion, cheap glycinate/citrate work just as well.
Full Magnesium L-Threonate evidence reviewLithium orotate vs Magnesium L-Threonate: head to head
- FDA status / approved use
Lithium orotate
Sold over the counter as a low-dose lithium supplementMagnesium L-Threonate
Dietary supplement; not an approved treatment for any condition- Marketed for
Lithium orotate
Mood, cognition, neuroprotection, longevityMagnesium L-Threonate
Memory, brain magnesium- Outcome areas
Lithium orotate
Mood / anxiety / stress; Cognitive function / memory; Longevity / lifespanMagnesium L-Threonate
Cognitive function / memory- Evidence grade
Lithium orotate
Preclinical / minimalMagnesium L-Threonate
Clinical data- How it works
Lithium orotate
Inhibits GSK-3β, affecting tau phosphorylation and neuron survivalMagnesium L-Threonate
Magnesium salt designed to raise magnesium in the brain specifically- Route and dosing
Lithium orotate
Oral capsule, often about 1 to 5 mg elemental lithiumMagnesium L-Threonate
Oral powder; about 144 mg elemental magnesium per day, often split- Headline human result
Lithium orotate
Not establishedMagnesium L-Threonate
Improved a cognitive test composite (p = 0.003, Cohen's d = 0.91) over 12 weeks in a small, industry-linked 2016 RCT- Strongest evidence
Lithium orotate
Water-lithium epidemiology, Br J Psychiatry 2009. Little or no controlled human outcome data for the marketed useLithium orotate evidence reviewPubMed 19407280Magnesium L-Threonate
MMFS-01 RCT, J Alzheimers Dis 2016Magnesium L-Threonate evidence reviewPubMed 26519439- Key safety signal
Lithium orotate
Narrow therapeutic window at higher doses (thyroid, kidney, tremor); interacts with some diuretics and NSAIDsMagnesium L-Threonate
Loose stools at high intake; can accumulate with reduced kidney function; binds some antibiotics and thyroid hormone- How it is obtained
Lithium orotate
Over the counter as a dietary supplementMagnesium L-Threonate
Over the counter as a dietary supplement
| Lithium orotate | Magnesium L-Threonate | |
|---|---|---|
| FDA status / approved use | Sold over the counter as a low-dose lithium supplement | Dietary supplement; not an approved treatment for any condition |
| Marketed for | Mood, cognition, neuroprotection, longevity | Memory, brain magnesium |
| Outcome areas | Mood / anxiety / stress; Cognitive function / memory; Longevity / lifespan | Cognitive function / memory |
| Evidence grade | Preclinical / minimal | Clinical data |
| How it works | Inhibits GSK-3β, affecting tau phosphorylation and neuron survival | Magnesium salt designed to raise magnesium in the brain specifically |
| Route and dosing | Oral capsule, often about 1 to 5 mg elemental lithium | Oral powder; about 144 mg elemental magnesium per day, often split |
| Headline human result | Not established | Improved a cognitive test composite (p = 0.003, Cohen's d = 0.91) over 12 weeks in a small, industry-linked 2016 RCT |
| Strongest evidence | Water-lithium epidemiology, Br J Psychiatry 2009. Little or no controlled human outcome data for the marketed useLithium orotate evidence reviewPubMed 19407280 | MMFS-01 RCT, J Alzheimers Dis 2016Magnesium L-Threonate evidence reviewPubMed 26519439 |
| Key safety signal | Narrow therapeutic window at higher doses (thyroid, kidney, tremor); interacts with some diuretics and NSAIDs | Loose stools at high intake; can accumulate with reduced kidney function; binds some antibiotics and thyroid hormone |
| How it is obtained | Over the counter as a dietary supplement | Over the counter as a dietary supplement |
marks a row where the two differ. “Not established” marks a cell the available evidence does not answer. Evidence grades come from our evidence matrix, which grades each molecule on the human data for the use it is marketed for.
- Clinical data:
- Tested in humans — but investigational, discontinued, or proven only on a surrogate marker (not the marketed outcome).
- Preclinical / minimal:
- Evidence is largely animal, in-vitro, or anecdotal. Little or no controlled human outcome data for the marketed use.
Our verdict
Neither has a randomized trial of the product actually on the shelf. Magnesium L-threonate's 'raises brain magnesium and memory' story rests on one 2010 rat study plus one small industry-linked human trial, and for simple repletion cheap glycinate or citrate work just as well. Lithium orotate's interesting signal is epidemiological — regions with more lithium in drinking water show lower suicide rates, at doses far below prescription lithium — but no RCT has tested the low-dose orotate salt sold as a supplement. Lithium is also a drug with a narrow therapeutic window, which makes missing trial data a heavier problem on that side.
Lithium orotate fits if
You are reading the water-lithium epidemiology and want to understand what it does and does not imply about a supplement.
Magnesium L-Threonate fits if
You want magnesium and are weighing whether the threonate form justifies its price over glycinate or citrate.
Lithium orotate vs Magnesium L-Threonate: common questions
- Is either lithium orotate or magnesium L-threonate FDA-approved?
- No. Lithium orotate is sold over the counter as a low-dose lithium supplement. Magnesium L-threonate is a dietary supplement; not an approved treatment for any condition.
- Which has stronger human evidence, lithium orotate or magnesium L-threonate?
- Magnesium L-threonate. It has human clinical data (key source: MMFS-01 RCT, J Alzheimers Dis 2016), while lithium orotate has only preclinical or minimal evidence (key source: Water-lithium epidemiology, Br J Psychiatry 2009).
- What are the main safety concerns with lithium orotate and magnesium L-threonate?
- Lithium orotate has a narrow therapeutic window at higher doses (thyroid, kidney, tremor); interacts with some diuretics and NSAIDs. For magnesium L-threonate, watch for loose stools at high intake; can accumulate with reduced kidney function; binds some antibiotics and thyroid hormone.
Key studies behind each
Lithium orotate
- Ohgami H, Terao T, Shiotsuki I, et al. (2009). Lithium levels in drinking water and risk of suicide. Br J Psychiatry. PubMed 19407280
- Memon A, Rogers I, Fitzsimmons SMDD, et al. (2020). Association between naturally occurring lithium in drinking water and suicide rates: systematic review and meta-analysis of ecological studies. Br J Psychiatry. PubMed 32716281
- Eyre-Watt B, Mahendran E, Suetani S, et al. (2021). The association between lithium in drinking water and neuropsychiatric outcomes: A systematic review and meta-analysis from across 2678 regions containing 113 million people. Aust N Z J Psychiatry. PubMed 33045847
- Kessing LV, Gerds TA, Knudsen NN, et al. (2017). Association of Lithium in Drinking Water With the Incidence of Dementia. JAMA Psychiatry. PubMed 28832877
Magnesium L-Threonate
- Slutsky I, Abumaria N, Wu LJ, et al. (2010). Enhancement of learning and memory by elevating brain magnesium. Neuron. PubMed 20152124
- Liu G, Weinger JG, Lu ZL, Xue F, Sadeghpour S. (2016). Efficacy and Safety of MMFS-01, a Synapse Density Enhancer, for Treating Cognitive Impairment in Older Adults: A Randomized, Double-Blind, Placebo-Controlled Trial. J Alzheimers Dis. PubMed 26519439
- Kirkland AE, Sarlo GL, Holton KF. (2018). The Role of Magnesium in Neurological Disorders. Nutrients. PubMed 29882776
- Alateeq K, Walsh EI, Cherbuin N. (2023). Dietary magnesium intake is related to larger brain volumes and lower white matter lesions with notable sex differences. Eur J Nutr. PubMed 36899275
The full evidence reviews
- Lithium orotate: an intriguing population signal, almost no direct evidence
Trace lithium in drinking water tracks with lower suicide and dementia rates — but that's an association, and lithium orotate itself has essentially no controlled human trials.
Updated August 2026
- Magnesium L-Threonate (Magtein): does the 'brain magnesium' actually work?
A real preclinical mechanism — but the 'raises brain magnesium + sharpens memory' story rests on one 2010 rodent study and one small, industry-linked human trial. For plain repletion, cheap glycinate works fine.
Updated August 2026