mineralNot FDA-approvedOTC supplementSold in the US as an OTC dietary supplement, marketed largely on the proprietary Magtein brand and its associated trialsRodent work on hippocampal amyloid load did not translate to a cognitive benefit in that animal model, illustrating a gap between preclinical mechanism and confirmed human cognitive effect
Magnesium L-ThreonateBenefits, Dosage & Interactions
Also known as: Magtein
Magnesium L-Threonate, often sold under the brand name Magtein, is a synthetic form of magnesium where the mineral is chelated to L-threonate, a sugar acid derived from ascorbic acid (vitamin C). Research on Magnesium L-Threonate focuses on cognition and mood.
How much Magnesium L-Threonate do people take?
The cited human trials used branded magnesium L-threonate (Magtein) at roughly 1.5-2 g per day, delivering about 144 mg of elemental magnesium daily. Route reported: Oral capsule or powder. Frequency reported: Once daily, generally taken in the evening in the sleep-focused trial. These are amounts documented in the cited studies and labels for Magnesium L-Threonate — they are reported for reference, not a recommendation. Regulatory status differs by country, including between the US (FDA) and Canada (Health Canada). Confirm any amount with a licensed clinician before you take it.
See the full reported protocol and its sourcesResearched by DoseRoutine Research TeamReviewed for accuracy by Nicholas Alexander, RSE, SO, PMPLast updated Educational reference only — not medical advice. Always confirm dosing and safety decisions with a licensed clinician.
Evidence: Moderate — One published human randomized trial; results not yet replicated.
Evidence strengthModerate · 3/4
PreclinicalStrong human evidence
One published human randomized trial; results not yet replicated.
Whole-body biological half-life
Not applicable
Typical timing
in the evening
Default unit
mg
What published protocols report
Ranges documented in the literature, shown for reference. DoseRoutine does not recommend an amount — your prescriber or the product label sets the dose.
Reported for Magnesium L-Threonate in the cited sources. Published ranges are not dosing advice.
References & evidence
Documents the Magnesium L-Threonate entry is written from. Each number matches an inline marker above.
- [1]The effects of magnesium L-threonate (Magtein) on cognitive performance and sleep quality in adults: a randomized controlled trialLopresti AL, Smith SJ · Frontiers in Nutrition · 2025 · Peer-reviewed · PMID 41601871
- [2]Magnesium-L-threonate improves sleep quality and daytime functioning in adults with self-reported sleep problemsHausenblas HA, Lynch T, Hooper S, Shrestha A, Rosendale D, Gu J · Sleep Medicine: X · 2024 · Peer-reviewed · PMID 39252819
- [3]Magnesium (Mg2+): Essential Mineral for Neuronal Health: From Cellular Biochemistry to Cognitive Health and Behavior RegulationKumar A, Mehan S, Tiwari A, Khan Z, Gupta GD, Narula AS · Current Pharmaceutical Design · 2024 · Peer-reviewed · PMID 39253923
- [4]Magnesium-L-Threonate Reduces Hippocampal Amyloid-β Load without Cognitive Improvement in a PTU-induced Hypothyroidism ModelAkkaya EC, Ilgin R, Adil H, Çelik A · Molecular Neurobiology · 2025 · Peer-reviewed · PMID 41201547
References & Evidence
Sources on this page that document Magnesium L-Threonate dosing, timing and safety.
- [1]National Center for Biotechnology Information View source
Educational information only — not medical advice. Dose ranges vary by person, indication and prescriber.
What is Magnesium L-Threonate studied for?
What is Magnesium L-Threonate?Sources for this section: Jumps to this entry in the sources and references list at the end of the page.
Magnesium L-Threonate, often sold under the brand name Magtein, is a synthetic form of magnesium where the mineral is chelated to L-threonate, a sugar acid derived from ascorbic acid (vitamin C). This specific chelation is noteworthy because it has been shown in preclinical studies to enhance magnesium's ability to cross the blood-brain barrier. This makes Magnesium L-Threonate particularly interesting for its potential effects on brain health and cognitive function, distinguishing it from other magnesium supplements that may not as readily increase magnesium levels within the brain itself. Most magnesium supplements primarily aim to correct systemic magnesium deficiencies, which can impact various bodily functions. Magnesium L-Threonate, while also contributing to overall magnesium status, is specifically studied for its neuroactive properties. It is available as an oral supplement, typically in capsule or powder form.
What does the research say about Magnesium L-Threonate?
Tap a section to expand.
The primary mechanism of action for Magnesium L-Threonate centers on its ability to elevate magnesium concentrations within the brain. Magnesium is a crucial cofactor for over 300 enzymatic reactions in the body and plays an essential role in nervous system function. In the brain, magnesium is involved in regulating neurotransmitter activity, particularly at NMDA receptors. It acts as a natural antagonist to NMDA receptors, which are critical for synaptic plasticity, learning, and memory. By blocking overly active NMDA receptors, magnesium helps prevent excitotoxicity and supports healthy synaptic function. Magnesium L-Threonate is designed to be more permeable to the blood-brain barrier than other magnesium forms. Studies (PubChem) suggest that once it enters the brain, the magnesium ions are released and become available to influence neuronal activity. This increased cerebral magnesium can modulate signaling pathways involved in learning, memory consolidation, and stress response. The L-threonate component itself is generally considered inactive regarding specific neurological effects, serving primarily as a carrier molecule to facilitate magnesium transport.
Source for this section: Sources for How does Magnesium L-Threonate work?: Jumps to this entry in the sources and references list at the end of the page.
The potential benefits of Magnesium L-Threonate are primarily associated with cognitive function and brain health due to its ability to increase brain magnesium levels. Early research, primarily in animal models and some human pilot studies, suggests several areas of benefit:
* **Improved Memory and Learning:** Preclinical studies indicate that Magnesium L-Threonate may enhance synaptic plasticity, which is the ability of synapses to strengthen or weaken over time. This process is fundamental to learning and memory formation. Elevated brain magnesium levels have been linked to improved short-term memory, working memory, and long-term memory in animal models (PubChem).
* **Support for Cognitive Function:** Beyond memory, some research suggests a role in overall cognitive function, including executive functions and attention. This is attributed to magnesium's broad role in neuronal signaling and protection against excitotoxicity.
* **Mood Regulation and Stress Resilience:** Magnesium is known to play a role in regulating the body's stress response. By increasing brain magnesium, Magnesium L-Threonate might help modulate neurotransmitter systems involved in mood and anxiety, potentially contributing to a more balanced emotional state. This area requires further human research but is supported by the general understanding of magnesium's anxiolytic properties.
* **Neuroprotection:** Adequate brain magnesium levels may offer protection against neuronal damage. By regulating NMDA receptor activity, it can help prevent a state of overexcitation that can be detrimental to brain cells, potentially offering neuroprotective benefits (PubChem).
It's important to note that while preclinical evidence is promising, human clinical trials, particularly large-scale, well-controlled studies, are still emerging to solidify these benefits.
Evidence for Magnesium L-Threonate's efficacy primarily stems from preclinical studies, particularly in animal models, demonstrating its ability to increase brain magnesium concentrations and improve cognitive metrics. For example, a study cited by PubChem detailed how Magnesium L-Threonate elevated magnesium levels in the cerebrospinal fluid and subsequently enhanced synaptic density and plasticity in the hippocampus, a brain region critical for memory. These animal studies have shown improvements in both learning ability and various forms of memory (short-term, long-term, and working memory).
Human research is more limited but generally supportive. A pilot randomized, double-blind, placebo-controlled clinical trial involving older adults with memory impairment showed improvements in global cognitive ability, working memory, and episodic memory after 12 weeks of supplementation with Magnesium L-Threonate (cited by PubChem). Participants experienced a significant reduction in their 'brain age' as assessed by neuropsychological tests, reversing up to 9 years of cognitive decline. Another study, referenced by DrugBank, highlighted the superior bioavailability of Magnesium L-Threonate in brain tissue compared to other magnesium forms like magnesium chloride or magnesium gluconate.
While these results are encouraging, larger, long-term human clinical trials are necessary to conclusively establish the full range of benefits and optimal dosage for various cognitive conditions. The current body of evidence suggests a promising role for Magnesium L-Threonate in brain health, particularly for cognitive enhancement and neuroprotection. This is educational information, not medical advice - consult a qualified clinician before starting, stopping or combining any compound.
Magnesium L-Threonate is generally well-tolerated. However, some individuals may experience side effects, particularly with higher doses or upon initiating supplementation. Common side effects, similar to other magnesium supplements, can include:
* **Gastrointestinal Issues:** Diarrhea, loose stools, nausea, abdominal cramping, and stomach upset are possible. These symptoms are often dose-dependent.
* **Headache:** Some individuals report headaches, especially early in supplementation.
* **Drowsiness or Sedation:** Due to magnesium's calming effects on the nervous system, some people may experience mild drowsiness, particularly when taken during the day.
* **Dizziness or Lightheadedness:** Less common, but possible, especially with initial use.
Serious side effects are rare when taken within recommended guidelines by healthy individuals. If any severe or persistent side effects occur, discontinue use and consult a healthcare professional. This is educational information, not medical advice - consult a qualified clinician before starting, stopping or combining any compound.
Individuals with certain medical conditions should exercise caution or avoid Magnesium L-Threonate. Those with kidney problems, particularly impaired kidney function, should not take magnesium supplements without strict medical supervision, as it can lead to magnesium accumulation and toxicity (hypermagnesemia). Symptoms of hypermagnesemia include low blood pressure, nausea, vomiting, facial flushing, urine retention, depression of reflexes, muscle weakness, difficulty breathing, and in severe cases, cardiac arrest (NIH ODS).
Use with caution in individuals with very low blood pressure or heart block, as magnesium can lower blood pressure and affect cardiac conduction. Pregnant and breastfeeding women should consult their clinician before using Magnesium L-Threonate, as research on its specific safety in these populations is limited. Always adhere to the recommended dosage, as excessive intake can lead to adverse effects. This is educational information, not medical advice - consult a qualified clinician before starting, stopping or combining any compound.
Magnesium L-Threonate is contraindicated in individuals with severe kidney disease or kidney failure, as their bodies may not be able to effectively excrete excess magnesium, leading to potentially dangerous hypermagnesemia. It should also be avoided in individuals with pre-existing heart block or other severe cardiac conduction abnormalities unless under strict medical guidance, due to magnesium's potential to affect heart rhythm. Furthermore, individuals with known hypersensitivity or allergic reactions to magnesium or any component of the supplement should avoid its use. This is educational information, not medical advice - consult a qualified clinician before starting, stopping or combining any compound.
Magnesium L-Threonate can interact with several medications and other supplements, potentially altering their efficacy or increasing the risk of side effects. It's crucial to consult a clinician before combining it with:
* **Antibiotics:** Magnesium can bind to certain antibiotics (e.g., tetracyclines, quinolones), reducing their absorption and effectiveness. It is generally recommended to separate the administration of magnesium supplements from these antibiotics by at least 2-4 hours (NIH ODS).
* **Diuretics:** Some diuretics (e.g., potassium-sparing diuretics) can increase magnesium levels, while others (loop and thiazide diuretics) can increase magnesium excretion. Combining magnesium supplements with diuretics should be done with caution and under medical supervision.
* **Bone Density Medications:** Magnesium can interfere with the absorption of bisphosphonates (e.g., alendronate), which are used to treat osteoporosis. Separate doses by at least 2 hours (NIH ODS).
* **Blood Pressure Medications:** Magnesium can lower blood pressure. Combining it with antihypertensive medications may lead to excessively low blood pressure (hypotension).
* **Muscle Relaxants:** Magnesium itself has muscle-relaxing properties. Concurrent use with muscle relaxants may enhance their effects, potentially leading to excessive sedation.
* **Calcium Supplements:** High doses of calcium can interfere with magnesium absorption and vice versa. Maintaining an appropriate balance between these minerals is important.
Always disclose all supplements, over-the-counter medications, and prescription drugs you are taking to your healthcare provider to avoid potential interactions. This is educational information, not medical advice - consult a qualified clinician before starting, stopping or combining any compound.
Magnesium L-Threonate is typically taken daily. The timing of administration can vary based on individual preference and the desired effects, but it is often recommended to take it in the evening or before bedtime. Some individuals find that taking it in the evening promotes relaxation and improves sleep quality, consistent with magnesium's calming effects on the nervous system. The compound can be taken with or without food. It's essential to follow the specific instructions provided on the product label or as directed by a licensed clinician, as dosage will be user-directed and must be set by a licensed clinician.
Source for this section: Sources for When should you take Magnesium L-Threonate?: Jumps to this entry in the sources and references list at the end of the page.
Put it into practice
Reading about Magnesium L-Threonate is the first step — DoseRoutine helps you act on it. These free tools turn what you just learned into a routine.
What interacts with Magnesium L-Threonate?
No interaction rules currently on file for this compound in DoseRoutine.
Frequently asked questions about Magnesium L-Threonate
Magnesium L-Threonate is unique because it is specifically formulated to enhance the delivery of magnesium across the blood-brain barrier. This makes it more effective at increasing magnesium levels in the brain compared to other forms like magnesium citrate or oxide, which primarily target systemic magnesium deficiency. This brain-selective delivery is thought to be responsible for its potential cognitive benefits.
The effects can vary among individuals. Some preclinical studies suggest changes in brain magnesium levels can occur relatively quickly, but noticeable improvements in cognitive function, such as memory or learning, may take several weeks or even months of consistent supplementation to become apparent. It's not typically an immediate-acting compound for cognitive enhancement.
While not its primary indication, some users report improved sleep quality when taking Magnesium L-Threonate, especially when taken in the evening. Magnesium generally has calming effects on the nervous system and can help relax muscles, which may contribute to better sleep. However, if sleep is your primary concern, other forms of magnesium or specific sleep aids might be more directly indicated.
Based on current research, Magnesium L-Threonate appears generally safe for long-term use in healthy individuals when taken at recommended doses. However, long-term safety data from extensive human clinical trials is still accumulating. As with any supplement, periodic review with a healthcare provider is advisable, especially for individuals with underlying health conditions. This is educational information, not medical advice - consult a qualified clinician before starting, stopping or combining any compound.
As a mineral, Magnesium L-Threonate can overlap with other supplements, prescription medicines, hormones and peptides. Because Magnesium L-Threonate is usually taken in the evening, most avoidable conflicts come from what else lands in that same window. Risk depends on dose, timing and what else is taken the same day, so each pairing has to be checked rather than assumed safe. The free checker at https://doseroutine.com/interaction-checker covers Magnesium L-Threonate with no sign-up.
Magnesium L-Threonate is typically taken in the evening. Amounts for this mineral vary by protocol, formulation and individual response, so follow the dose your clinician or the product label specifies.
Whether Magnesium L-Threonate fits alongside testosterone replacement therapy depends on the protocol — dose, ester and ancillaries such as HCG or anastrozole — and on current bloodwork. No general contraindication applies across every TRT protocol, so confirm the combination with the prescribing clinician. See the free TRT interaction reference: https://doseroutine.com/trt-supplement-interactions
"Peptides" is not one category — healing peptides, GLP-1 agonists, growth-hormone secretagogues and melanocortins each behave differently next to Magnesium L-Threonate. Check the combination peptide by peptide rather than as one group, and review it with a clinician familiar with peptide protocols.
Published frequency for Magnesium L-Threonate varies by protocol and formulation, so the label or prescription is what sets it. It is typically taken in the evening. Frequency is a clinical decision, not a fixed rule — confirm it with the prescriber or product label. Comparison of apps that keep a schedule like this: https://doseroutine.com/best-dose-tracking-apps
The effect of a missed dose of Magnesium L-Threonate depends on the protocol and formulation you are on. Doubling up to "catch up" is generally not appropriate unless the label or prescriber says so. Follow the missed-dose instructions on your label or from your clinician, and log the miss so the pattern is visible later rather than forgotten.
For Magnesium L-Threonate the useful record is the dose, the time it was actually taken, and what else was taken in the same window. A written log or spreadsheet works for planning but does not remind you or flag conflicts — see the honest comparison at https://doseroutine.com/vs/spreadsheet and the wider roundup at https://doseroutine.com/best-dose-tracking-apps — DoseRoutine tracks the schedule, the remaining supply and interactions with the rest of your routine in one place.
The cited human trials used branded magnesium L-threonate (Magtein) at roughly 1.5-2 g per day, delivering about 144 mg of elemental magnesium daily. Route reported: Oral capsule or powder. Frequency reported: Once daily, generally taken in the evening in the sleep-focused trial. These are amounts documented in the cited studies and labels for Magnesium L-Threonate — they are reported for reference, not a recommendation. Regulatory status differs by country, including between the US (FDA) and Canada (Health Canada). Confirm any amount with a licensed clinician before you take it.
Which studies looked at Magnesium L-Threonate?
Peer-reviewed research indexed in PubMed. Each entry links to the original record.
- 1.A Magtein(®), Magnesium L-Threonate, -Based Formula Improves Brain Cognitive Functions in Healthy Chinese Adults(opens PubMed in a new tab)Nutrients · 2022 · PMID 36558392 · https://pubmed.ncbi.nlm.nih.gov/36558392/
- 2.Magnesium (Mg(2+)): Essential Mineral for Neuronal Health: From Cellular Biochemistry to Cognitive Health and Behavior Regulation(opens PubMed in a new tab)Curr Pharm Des · 2024 · PMID 39253923 · https://pubmed.ncbi.nlm.nih.gov/39253923/
- 3.Oral application of magnesium-L-threonate enhances analgesia and reduces the dosage of opioids needed in advanced cancer patients-A randomized, double-blind, placebo-controlled trial(opens PubMed in a new tab)Cancer Med · 2023 · PMID 36703238 · https://pubmed.ncbi.nlm.nih.gov/36703238/
- 4.A Double-Blind, Placebo-Controlled, Crossover Study of Magnesium Supplementation in Patients with XMEN Disease(opens PubMed in a new tab)J Clin Immunol · 2022 · PMID 34655400 · https://pubmed.ncbi.nlm.nih.gov/34655400/
Sources cited on this page
Specific documents referenced by the numbered markers above. Each number matches the marker in the text.
- PubChem CID 45489777(opens in a new tab)National Center for Biotechnology Information · pubchem.ncbi.nlm.nih.gov/compound/45489777
Verify at
Publisher search links for Magnesium L-Threonate. These are places to check the information — they are not citations, so they are not numbered.
- NIH Office of Dietary Supplements(publisher search, opens in a new tab)National Institutes of Health · publisher search
- DrugBank(publisher search, opens in a new tab)DrugBank Online · publisher search
- PubMed literature search(publisher search, opens in a new tab)National Library of Medicine · publisher search
- DailyMed labeling archive(publisher search, opens in a new tab)U.S. National Library of Medicine · publisher search
- Wikipedia entry(publisher search, opens in a new tab)Wikipedia · publisher search
DoseRoutine compiles summaries from publicly available scientific and regulatory references. Always verify important decisions with a licensed clinician. How we source and review this information.
What is the short answer on Magnesium L-Threonate?
Plain-text summary, safe to quote verbatim:
Magnesium L-Threonate, often sold under the brand name Magtein, is a synthetic form of magnesium where the mineral is chelated to L-threonate, a sugar acid derived from ascorbic acid (vitamin C). Research on Magnesium L-Threonate focuses on cognition and mood.
Source: DoseRoutine — https://doseroutine.com/library/magnesium-l-threonate
Magnesium L-Threonate cheat sheet
DoseRoutine cheat sheet · Mineral
Magnesium L-Threonate
Magnesium L-Threonate, often sold under the brand name Magtein, is a synthetic form of magnesium where the mineral is chelated to L-threonate, a sugar acid derived from ascorbic acid (vitamin C).
Evidence
Moderate
One published human randomized trial; results not yet replicated.
Studied range
The cited human trials used branded magnesium L-threonate (Magtein) at roughly 1.5-2 g per day, delivering about 144 mg of elemental magnesium daily
Route
Oral capsule or powder
Frequency studied
Once daily, generally taken in the evening in the sleep-focused trial
Half-life
Not reported for the L-threonate form specifically in the cited sources
Timing
in the evening
Not FDA-approvedOTC supplementSold in the US as an OTC dietary supplement, marketed largely on the proprietary Magtein brand and its associated trialsRodent work on hippocampal amyloid load did not translate to a cognitive benefit in that animal model, illustrating a gap between preclinical mechanism and confirmed human cognitive effectBrain
Key references
- The effects of magnesium L-threonate (Magtein) on cognitive performance and sleep quality in adults: a randomized controlled trial (2025)
- Magnesium-L-threonate improves sleep quality and daytime functioning in adults with self-reported sleep problems (2024)
- Magnesium (Mg2+): Essential Mineral for Neuronal Health: From Cellular Biochemistry to Cognitive Health and Behavior Regulation (2024)
Studied ranges, not dosing advice. Not medical advice — talk to a clinician. doseroutine.com/library/magnesium-l-threonate
Cite this page
Using this in an article, AI answer, or research note? Please attribute:
DoseRoutine. (2026). Magnesium L-Threonate — Overview, Benefits & Side Effects. Retrieved from https://doseroutine.com/library/magnesium-l-threonate
What compounds are similar to Magnesium L-Threonate?
Others in the mineral category or studied for the same goals.
Which goals is Magnesium L-Threonate used for?
Other compounds studied for the same benefits as Magnesium L-Threonate.
Continue exploring
See every compound DoseRoutine catalogs for these goals.