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Magnesium L-Threonate

potential cognitive support and brain magnesium enhancement

mineral
Human trial evidenceTraditional useInteraction riskNeeds more research

Brain-penetrating magnesium for cognition, memory, and sleep.

Magnesium L-Threonate is a synthetic form of magnesium that has garnered interest due to its purported ability to cross the blood-brain barrier more effectively than other magnesium compounds. This characteristic is thought to allow it to influence magnesium levels within the brain, potentially impacting cognitive functions. While magnesium is an essential mineral involved in over 300 enzymatic reactions throughout the body, including those critical for nerve function, energy production, and muscle contraction, the specific benefits attributed to Magnesium L-Threonate are largely related to its potential neurological effects. Research in this area is still emerging, with much of the foundational work conducted in preclinical models. Consumers often seek Magnesium L-Threonate for cognitive support, including memory and learning, and for its potential role in managing stress and sleep. However, it is important to note that clinical evidence in humans is limited, and more robust studies are needed to confirm these effects.

Quick answer

What it is: Magnesium L-Threonate is a synthetic form of magnesium that has garnered interest due to its purported ability to cross the blood-brain barrier more effectively than other magnesium compounds.

May support:Parkinson's Disease, Burnout, ADHD, Magnesium Deficiency

Evidence Summary

The current understanding of Magnesium L-Threonate's effects is primarily derived from preclinical studies, particularly in animal models. While these studies provide a mechanistic basis and suggest potential benefits, human clinical trials are limited in number and scope. Therefore, the evidence base for its efficacy in humans is considered preliminary.

Last reviewed · Jun 2026

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Why It Works

Crosses BBB; raises synaptic Mg++ and density.

How it works in more detail

Magnesium is a crucial cofactor for numerous enzymes and plays a vital role in neuronal excitability, synaptic transmission, and long-term potentiation, which are fundamental processes for learning and memory. The L-threonate component of Magnesium L-Threonate is thought to act as a carrier, facilitating the transport of magnesium ions across the blood-brain barrier. Once in the brain, increased magnesium levels may enhance synaptic plasticity, potentially by influencing NMDA receptor activity and modulating intracellular calcium levels, which are critical for neuronal signaling and memory formation.

How to use

Always consult a qualified clinician.

Editorial guidance

Suggested dosage
1500–2000 mg/day
Research dosage range
Preclinical studies have used varying dosages, often extrapolated to human equivalents. Human studies, though limited, have explored doses providing approximately 144-200 mg of elemental magnesium per day.
Typical onset
The onset of noticeable effects may vary, with some individuals reporting changes in cognitive function or sleep patterns within a few weeks of consistent use. However, robust data on onset timing fro
Typical forms
capsule, powder
Quality markers
Look for products from reputable manufacturers that provide third-party testing for purity and potency. Ensure the label clearly states the amount of elemental magnesium per serving, not just the total Magnesium L-Threonate compound.
Medication interactions
  • Antibiotics (tetracyclines and quinolones)
  • Diuretics (potassium-sparing)
  • Bisphosphonates
  • Proton pump inhibitors (long-term use)
Avoid if
  • Severe kidney disease

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Suggested dosage

1500–2000 mg/day

General guidance — discuss specifics with a clinician.

Active medicinal compounds

Magnesium ion (Mg2+)

Traditional use

Magnesium L-Threonate is a synthetic compound and does not have a history of traditional use. Magnesium itself, however, has been recognized for its health benefits across various traditional medicine systems.

Safety

Safety warnings

Mild drowsiness; well tolerated.

Avoid if

  • Severe kidney disease

Medication interactions

  • Antibiotics (tetracyclines and quinolones)
  • Diuretics (potassium-sparing)
  • Bisphosphonates
  • Proton pump inhibitors (long-term use)

Reported side effects

  • Drowsiness
  • Headache
  • Dizziness
  • Gastrointestinal upset (e.g., diarrhea, nausea) at higher doses

General guidance — discuss specifics with a clinician.

Evidence ecosystem

Scientific literature, clinical guidance, government sources, ongoing research, traditional use, and lived experience — grouped by source type and quality.

Overall grade

The current understanding of Magnesium L-Threonate's effects is primarily derived from preclinical studies, particularly in animal models. While these studies provide a mechanistic basis and suggest potential benefits, human clinical trials are limited in number and scope. Therefore, the evidence base for its efficacy in humans is considered preliminary.

Clinical Trial Registries(7)

Registered ongoing or completed trials (ClinicalTrials.gov).

Moderate Quality
  • A Double-blind, Placebo-controlled, Crossover Study of Magnesium Supplementation in Patients With XMEN Syndrome

    n=8 · NCT02496676 · COMPLETED · COMPLETED

    Background: \- X-linked immunodeficiency with magnesium defect, Epstein-Barr virus infection, and neoplasia syndrome is called XMEN syndrome. In this genetic condition, the cells have less magnesium than normal. This makes it hard for the body to fight infections. Researchers want to see if magnesium supplements can make it easier for the body to fight infection. Objective: \- To see if magnesium supplements can strengthen the immune system and reduce the amount of Epstein-Barr virus in people with XMEN syndrome. Eligibility: \- People ages 6 and older who have XMEN syndrome Design: * Participants will be screened with: * Medical history * Physical exam * CT scan: Participants will drink a contrast and may get dye through an IV in the arm. They will lie in a machine that takes pictures of the body. * EKG: Small sticky patches on the body will trace heart rhythm. * Blood tests * The study has 2 parts. * Participants doing both parts will participate for 1 year and visit the clinic about 15 times. These visits will include a physical exam and blood and urine tests. * Participants doing only the first part finish in 6 months and have fewer visits. * For study part 1, participants will take magnesium pills for 3 months and placebo pills for another 3 months. * At 3 and 6 months, they will have physical exam, medical history, blood and urine tests, and an EKG. * If the magnesium pills are not helpful, participants will do study part 2. * They will be admitted to the hospital for 4 5 days to get magnesium for 3 days through an arm vein. * They will take magnesium pills for another 6 months.

    Clinical TrialClinicalTrials.govModerate Quality
  • Effects of Magnesium L-Threonate on Sleep, Recovery, and Athletic Performance in UCLA Athletes: A Randomized, Placebo-Controlled Trial

    n=100 · NCT07015047 · ACTIVE_NOT_RECRUITING · ACTIVE_NOT_RECRUITING

    This study is testing whether a special form of magnesium called magnesium L-threonate can help improve sleep quality, recovery, and physical performance in college athletes. Magnesium is important for muscle recovery and sleep, but many forms of it do not enter the brain well. Magnesium L-threonate is unique in that it can cross the blood-brain barrier and may improve deep and REM sleep, heart rate variability, and brain recovery. In this study, healthy UCLA varsity athletes aged 18 to 35 will be randomly assigned to take either magnesium L-threonate or a placebo each evening for 4 weeks. They will wear a WHOOP strap to track sleep, recovery, and heart rate data. Performance tests including jump height, grip strength, and reaction time will be completed before and after the 4-week period. This study will help researchers determine if this supplement can support recovery and training in athletes and whether wearable technology can help monitor these changes in real time.

    Clinical TrialClinicalTrials.govModerate Quality
  • Impact of Long-term Serum Magnesium and Potassium Levels Optimization and Multifactorial Adherence Intervention on the Progression of Diabetic Kidney Disease.

    n=160 · NCT04942119 · UNKNOWN · UNKNOWN

    Insufficient clinical evidence correlates the progression of diabetic kidney disease with electrolyte homeostasis in patients diagnosed with type 2 diabetes mellitus (T2DM), especially in the United Arab Emirates (UAE) population and what are the most effective interventions to slow chronic renal failure progression. In our research, we test the hypothesis that low serum magnesium and potassium levels are directly associated with the decline of kidney function in diabetic patients who did not have severely impaired renal function at baseline. In addition, we describe the effect of long-term multifactorial adherence interventions on medication adherence, diet adherence and follow-up visits using a telemedicine approach such as mobile applications in reducing the progression of chronic kidney disease and other diabetes-related complications. This study is a single-blind randomized control trial to demonstrate the causal relationship between potassium and magnesium levels and estimated glomerular filtration rate (eGFR) decline. The intervention group will be evaluated for manifestations of electrolyte imbalance and correction of serum magnesium and/or potassium levels will be initiated based on the last updated laboratory test. Moreover, they will receive education to reinforce diet and exercise changes at each follow up visit by a specialized dietitian with pharmacist-led comprehensive medication therapy management utilizing multifactorial adherence interventions to measure potential drug-drug or drug-food interactions, as well as medication and follow-up adherence through an integrated mobile application and fixed medication possession ratio (FMPR). This research is under progress, and summary of its findings will be reported. This study will suggest if additional national monitoring guidelines may be warranted. In addition, it will reduce diabetic burden, medication cost in UAE and improve patient satisfaction by reducing or delaying the progression of diabetic kidney disease in diabetic patients.

    Clinical TrialClinicalTrials.govModerate Quality

Limitations: Key limitations include the scarcity of large-scale, placebo-controlled human clinical trials. Most existing research is preclinical, and findings from animal models do not always translate directly to humans. There is also a lack of studies comparing Magnesium L-Threonate directly with other magnesium forms for brain-specific effects in humans.

This page is educational. Statements use phrases like "may support" and "has been studied for"because no remedy here is approved to cure, treat, or reverse any condition. Discussion happens on the ailment pages — community statistics here are derived from those reports. Always consult a qualified clinician.

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