Magnesium L-Threonate
Chelated magnesium form developed at MIT for blood-brain barrier penetration. Increases brain magnesium levels more effectively than other forms. Magnesium is an NMDA receptor co-agonist — modulates synaptic plasticity, long-term potentiation, and dendritic spine density.
Developed by Li et al. (MIT, 2010). Mouse studies showed improvement in learning and memory with CSF magnesium elevation. One small human RCT (Liu et al., Neuropharmacology 2016) showed cognitive improvements in older adults. Magtein® is the patented form used in most studies. Expensive vs other magnesium forms — magnesium glycinate gives comparable relaxation/sleep at lower cost.
GI upset at high doses (laxative effect from unabsorbed magnesium) — use split dosing. Blood pressure: mild antihypertensive effect. Magnesium competes with calcium for absorption — don't take with calcium supplements simultaneously.
External links to PubMed searches, ClinicalTrials.gov, and FDA materials. We do not host papers — we point at canonical sources.
Dietary supplement (DSHEA). Magnesium is an essential mineral — GRAS. No drug approval.
Distilled themes from named communities — Reddit threads, forums, creator commentary. Not direct quotes; not clinical evidence. Useful for calibrating expectations against what real self-experimenters report.
Huberman mention caused a surge in adoption. Users report better deep sleep quality and morning recall. Many downgrade to magnesium glycinate for cost after initial trial.