Magnesium L-Threonate
Magnesium form that crosses the blood-brain barrier; supports brain magnesium levels.
By Suplagen Team · Updated
What it is
Magnesium L-threonate (Magtein) is a patented magnesium chelate designed to elevate brain magnesium levels more effectively than other forms.
How it works
Crosses the blood-brain barrier; elevates brain Mg²⁺ to support synaptic density and NMDA receptor function.
What the evidence says
Emerging evidence for brain-specific magnesium elevation; limited but promising human cognitive trials.
How much to take
The catalog range is 1,000 to 2,000 mg daily, and the number needs one clarification: it refers to the magnesium L-threonate compound, not elemental magnesium. The compound is only about 8% elemental, so 2,000 mg delivers roughly 160 mg of magnesium.
That's why the pill count runs to 3 capsules per dose. Start at 1,000 mg; go to 2,000 mg, the ceiling, if you're specifically after the cognitive angle its emerging evidence points at.
When and how to take it
Evening, 1 to 2 hours before bed. Keep it 2 hours away from tetracycline antibiotics and oral bisphosphonates.
If you also take magnesium glycinate, count both toward your total; the supplemental ceiling is 350 mg elemental. Most people should pick one form, and the comparison explains which.
Who should skip it
Severe kidney disease and hypermagnesemia rule it out. Oral bisphosphonates carry a high-severity interaction (the two must be taken well apart), and tetracycline antibiotics a moderate one, so both need a 2 hour gap or a doctor's sign-off. Pregnancy is listed as safe.
Safety Notes
- Contains ~8% elemental magnesium. Higher pill count per dose than other Mg forms.
- Use caution with: severe kidney disease, hypermagnesemia.
- bisphosphonates (oral): Magnesium decreases absorption; separate ≥2h.
- tetracycline antibiotics: Chelation reduces absorption; space doses.
Timing With Other Supplements
- Magnesium Glycinate: Combining magnesium forms may exceed total Mg intake; track elemental Mg.
Common questions
When should you take magnesium L-threonate?
In the evening, 1 to 2 hours before bed. That's the catalog timing, and it fits the form's role in a sleep or cognition stack.
How much magnesium L-threonate is a dose?
1,000 to 2,000 mg of the compound, usually 3 capsules. Remember that's about 8% elemental magnesium, so it counts far less toward your magnesium total than the label number suggests.
Is magnesium L-threonate better than glycinate?
Different jobs. L-threonate was designed to raise brain magnesium, with emerging evidence; glycinate is the general-purpose, cheaper form. We compared them.