mineral · for poor memory
Magnesium L-Threonate
This form gets magnesium into the brain, where it strengthens the connections memory runs on.
Say that in clinical terms
Magnesium L-threonate elevates brain magnesium levels, enhancing synaptic plasticity and NMDA receptor function in the hippocampus, the brain region most critical for memory formation and consolidation.
How strong is the research?
3 papers read, 2 supporting.
Who was studied: Mice bred to develop Alzheimer’s-like changes. No healthy adults were tested.
How much to take
daily (split AM/PM)
1000–2000 mg
Consistent daily use is key. Memory improvements typically emerge after 6-8 weeks of supplementation.
Before you take it
- NIH ODS Tolerable Upper Intake Level is 350 mg/day of supplemental magnesium for adults (all magnesium salt forms combined); the limiting adverse effect used to set this level was diarrhea.
- Kidney disease: the kidneys clear excess magnesium; impaired renal function (chronic kidney disease) substantially increases risk of hypermagnesemia. Medical supervision required for any CKD patient taking supplemental magnesium.
- Antibiotic interaction: magnesium forms insoluble complexes with tetracyclines (e.g., doxycycline) and fluoroquinolones (e.g., ciprofloxacin), reducing antibiotic absorption. Per NIH ODS: take antibiotics at least 2 hours BEFORE or 4–6 hours AFTER magnesium supplements.
- Bisphosphonate interaction: magnesium reduces absorption of bisphosphonates (e.g., alendronate/Fosamax); separate doses by at least 2 hours.
- Diuretic interaction: loop and thiazide diuretics increase urinary magnesium excretion; potassium-sparing diuretics reduce excretion — clinical monitoring of serum magnesium is warranted.
- Proton pump inhibitor (PPI) interaction: long-term PPI use (>1 year) can itself cause hypomagnesemia; the FDA recommends monitoring serum magnesium levels in patients on chronic PPIs who also take magnesium supplements.
- The L-threonate carrier produces less osmotic GI/laxative effect than magnesium citrate or oxide at equivalent elemental magnesium doses, but gastrointestinal discomfort remains possible above the UL.
- Pregnancy and breastfeeding: the standard supplemental magnesium UL applies; physician consultation recommended before use.
When to take it
Best taken: evening
What we make of it
A mouse experiment, and Alzheimer’s mouse results translate to people badly.
The detail
What we cite is a study in genetically modified mice, not people. The brain-signalling mechanism is what that mouse paper tested, and findings from Alzheimer’s mouse models have a poor record of holding up in humans.