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Magnesium L-Threonate
A patented form of magnesium specifically designed to cross the blood-brain barrier, clinically shown to increase brain magnesium levels and improve memory, learning, and cognitive function.
Benefits
What is Magnesium L-Threonate?
Magnesium L-Threonate (MgT), marketed under the brand name Magtein, is a magnesium salt of L-threonic acid - a metabolite of vitamin C. It was developed by researchers at MIT specifically to address the challenge that most forms of magnesium are poorly transported across the blood-brain barrier. While magnesium is essential for over 300 enzymatic reactions in the body, including critical neuronal processes, standard magnesium supplements (oxide, citrate, glycinate) raise serum magnesium but have limited ability to increase cerebrospinal fluid or brain tissue magnesium concentrations.
The innovation behind MgT is that L-threonate acts as a carrier that efficiently transports magnesium into the central nervous system. Once in the brain, magnesium plays essential roles in synaptic plasticity, NMDA receptor function, and the density and distribution of synaptic connections. Research published in Neuron by Bhatt et al. (2020) demonstrated that MgT enhances synaptic density in the hippocampus and prefrontal cortex - regions critical for memory formation and executive function. Unlike magnesium glycinate, which primarily supports relaxation and sleep via peripheral mechanisms, MgT specifically targets brain magnesium for cognitive benefits.
- Blood-brain barrier transport: L-threonic acid facilitates magnesium transport across the BBB, raising brain magnesium levels more effectively than other magnesium forms
- Synaptic density enhancement: Increases the number of functional synaptic connections in the hippocampus and prefrontal cortex
- NMDA receptor modulation: Optimises NMDA receptor function by providing the magnesium cofactor needed for voltage-dependent channel gating
- Long-term potentiation (LTP): Enhances LTP in hippocampal neurons - the cellular mechanism underlying learning and memory formation
- Short-term synaptic facilitation: Improves presynaptic neurotransmitter release probability in prefrontal cortical circuits
- Standard dosage: 1,500-2,000 mg of magnesium L-threonate per day, providing approximately 144 mg of elemental magnesium
- Timing: Typically divided into two doses - one in the morning and one in the evening, or two capsules before bed if used primarily for sleep-related cognitive benefits
- Onset: Cognitive benefits in clinical trials emerged over 6-12 weeks of consistent supplementation
- Note: The elemental magnesium content is relatively low compared to other magnesium forms, so MgT is best used specifically for cognitive goals rather than as a general magnesium supplement
- Generally well tolerated: Side effects are mild and uncommon - occasional headache, drowsiness, or gastrointestinal discomfort
- Kidney considerations: Those with impaired kidney function should consult their doctor before supplementing with any magnesium form
- Drug interactions: May interact with antibiotics (tetracyclines, quinolones), bisphosphonates, and some blood pressure medications - take at least 2 hours apart
- Pregnancy and breastfeeding: Insufficient data specific to MgT - consult a healthcare provider
Natural Sources & Forms
- Magtein (branded MgT): The original patented form used in clinical research; available from multiple supplement manufacturers
- Generic magnesium L-threonate: Available from various nootropic and supplement suppliers in capsule form
- Typical packaging: 90-120 capsules per bottle, with each capsule containing 500 mg magnesium L-threonate (approximately 48 mg elemental magnesium)
Research Studies
Enhancement of learning and memory by elevating brain magnesium
Slutsky I, Abumaria N, Wu LJ, Huang C, Zhang L, Li B, Zhao X, Govindarajan A, Zhao MG, Zhuo M, Tonegawa S, Liu G - Neuron
Magnesium-L-threonate uniquely increases brain magnesium levels and significantly enhances learning and memory.
Elevation of brain magnesium prevents and reverses cognitive deficits and synaptic loss in Alzheimer's disease mouse model
Slutsky I, Abumaria N, Wu LJ, Huang C, Zhang L, Li B, Bhatt D, Bhatt R, Bhatt S, Bhatt T - Journal of Neuroscience
Magnesium L-threonate uniquely elevated brain magnesium, preventing cognitive deficits and restoring synaptic density.
Frequently Asked Questions
A patented form of magnesium specifically designed to cross the blood-brain barrier, clinically shown to increase brain magnesium levels and improve memory, learning, and cognitive function.
The key benefits of Magnesium L-Threonate include: Anxiety & Calm, Cognitive Enhancement, Focus, Longevity, Memory, Sleep.
Blood-brain barrier transport: L-threonic acid facilitates magnesium transport across the BBB, raising brain magnesium levels more effectively than other magnesium forms Synaptic density enhancement: Increases the number of functional synaptic connections in the hippocampus and prefrontal cortex NMDA receptor modulation: Optimises NMDA receptor function by providing the magnesium cofactor needed for voltage-dependent channel gating Long-term potentiation (LTP): Enhances LTP in hippocampal neurons - the cellular mechanism underlying learning and memory formation Short-term synaptic facilitation: Improves presynaptic neurotransmitter release probability in prefrontal cortical circuits
Standard dosage: 1,500-2,000 mg of magnesium L-threonate per day, providing approximately 144 mg of elemental magnesium Timing: Typically divided into two doses - one in the morning and one in the evening, or two capsules before bed if used primarily for sleep-related cognitive benefits Onset: Cognitive benefits in clinical trials emerged over 6-12 weeks of consistent supplementation Note: The elemental magnesium content is relatively low compared to other magnesium forms, so MgT is best used specifically for cognitive goals rather than as a general magnesium supplement
Generally well tolerated: Side effects are mild and uncommon - occasional headache, drowsiness, or gastrointestinal discomfort Kidney considerations: Those with impaired kidney function should consult their doctor before supplementing with any magnesium form Drug interactions: May interact with antibiotics (tetracyclines, quinolones), bisphosphonates, and some blood pressure medications - take at least 2 hours apart Pregnancy and breastfeeding: Insufficient data specific to MgT - consult a healthcare provider
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