10 Best Magnesium Threonate Supplement of 2026

Last updated on 04/02/2026
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Best Choice
1
9.7
Exceptional
Sports Research® Magnesium L-Threonate Capsules 2000mg - High-Absorption Magtein® for Enhanced Brain Health, Memory, Focus & Restful Sleep Support - Vegan · Non-GMO · Gluten Free - 180 Count
Sports Research

Sports Research® Magnesium L-Threonate Capsules 2000mg - High-Absorption Magtein® for Enhanced Brain Health, Memory, Focus & Restful Sleep Support - Vegan · Non-GMO · Gluten Free - 180 Count

Why we love it
  • Supports brain health benefits.
  • Easy absorption for enhanced cognition.
  • Made with premium quality ingredients.
Main Highlights
  • HIGHLY BIOAVAILABLE FORM: Magnesium L-threonate is the salt formed from mixing magnesium and threonic acid, a water-soluble substance derived from the metabolic breakdown of vitamin C. Easily absorbed, our magnesium L threonate capsules are used for their overall brain health benefits and may help support memory, focus, relaxation, mood, and cognition.
  • MADE WITH MAGTEIN: Magtein is a patented compound called threonic acid developed by a group of MIT researchers. Magtein is the only form that effectively crosses the blood-brain barrier and increases magnesium levels in the brain, which is critical for improving cognitive function. Our easy-to-swallow Magtein magnesium L-threonate veggie capsules are the easiest, most convenient way to add this essential mineral to your daily diet.
  • PREMIUM QUALITY: Sports Research takes pride in offering products that use only the best ingredients available so that you can have total peace of mind in the supplements that you are taking. Our magnesium supplement is verified non-GMO and free of gluten and gelatin.
  • MANUFACTURED IN THE USA: Our products are made in cGMP compliant facilities in the United States, using only the best ingredients from domestic & international origins. For us, it's all about quality control - so you can have confidence in your dietary supplements. We offer ninety (90) magnesium pills for a one (1) month supply. Reap all the benefits of this powerful and healthy magnesium threonate supplement!
  • THE SPORTS RESEARCH DIFFERENCE: Created in 1980, Sports Research is a privately-owned business born from a passion for fitness, wellness, and healing. Our goal is to help people live their best lives through real, research-backed ingredients created for every body — inside and out. We're fully dedicated to sourcing the highest quality products from around the world, backed by third party testing. We all deserve the best in our quest for healthy living. Our mission is to give you just that.
9.7
Exceptional
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🛡️Trusted by 100M+ UsersWhy?
Best Value
2
9.5
Superb
Metagenics Magnesium L-Threonate - Magtein Magnesium for Brain Health, Memory, Learning & Cognitive Support - Clinically Studied Bioavailable Form - Non-GMO, Gluten-Free, Vegan - 120 Capsules
Metagenics

Metagenics Magnesium L-Threonate - Magtein Magnesium for Brain Health, Memory, Learning & Cognitive Support - Clinically Studied Bioavailable Form - Non-GMO, Gluten-Free, Vegan - 120 Capsules

Why we love it
  • Clinically proven formulas support health.
  • Aids memory and concentration effectively.
  • Non-GMO, gluten-free, vegetarian-friendly.
Main Highlights
  • Brain & Cognitive Support: Formulated with Magtein magnesium L-threonate, the only form shown to effectively cross the blood-brain barrier to support memory, focus, and learning*
  • Clinically Researched Bioavailability: Demonstrated in clinical studies to increase magnesium levels in the brain, supporting healthy cognitive performance and mental clarity*
  • Sleep & Mood Benefits: Helps support relaxation, mood balance, and quality sleep as part of a healthy daily routine*
  • Suggested Use & Quality: Take 3 capsules daily (1 AM, 2 before sleep) or as directed; non-GMO, gluten-free, vegan, manufactured in GMP-certified facilities with ingredient traceability and third-party testing*
  • As the #1 Doctor Recommended Professional Supplement Brand, Metagenics delivers clinically proven, precision-crafted formulas to support your health at its core—because true wellness starts with integrity, balance, and expertise
9.5
Superb
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3
9.3
Superb
Now Foods Supplements Magtein, Magnesium L-Threonate, Cognitive Support*, 180 Veg Capsules
NOW Foods

Now Foods Supplements Magtein, Magnesium L-Threonate, Cognitive Support*, 180 Veg Capsules

Why we love it
  • Supports brain health effectively.
  • Easily absorbed for maximum benefit.
  • Manufactured with quality assurance.
Main Highlights
  • Magnesium (Mg) is an essential mineral best known for its role in bone and nervous system function*
  • Recent research has demonstrated that it is also critical for normal brain health and normal cognitive function by maintaining the density and stability of neuronal synapses.* However, most forms of Mg are not easily absorbed into the nervous system*
  • Magtein is a patented form of Mg that readily crosses the blood-brain barrier for utilization in the brain.* Laboratory studies indicate that Magtein supports brain health and may facilitate learning and memory, as well as a relaxed mood*
  • GMP Quality Assured: A-rated, third-party certification means that every aspect of the NOW manufacturing process has been examined. Our in-house laboratories are ISO/IEC accredited for laboratory testing including for stability, potency and product formulation.
  • Founded in 1968 by Elwood Richard, NOW is one of the largest independent, family- and employee-owned manufacturers of natural products
9.3
Superb
Amazon Logo
4
9.1
Superb
Save 19%
Nature Made Magnesium L-Threonate with Vitamin C & Vitamin D3, Provides 130 mg of Mag from 1800 mg Magnesium L Threonate, Cognitive Support Magnesium Supplement, 90 Capsules, 30 Day Supply
Nature Made

Nature Made Magnesium L-Threonate with Vitamin C & Vitamin D3, Provides 130 mg of Mag from 1800 mg Magnesium L Threonate, Cognitive Support Magnesium Supplement, 90 Capsules, 30 Day Supply

19% Off
Why we love it
  • Supports cognitive function effectively.
  • Promotes muscle relaxation and health.
  • Gluten-free with no artificial flavors.
Main Highlights
  • Cognitive & memory(1) support supplement: contains one 90 count bottle of Nature Made Magnesium L-Threonate with Vitamin C & Vitamin D 3 Capsules for a 30-day supply
  • Magtein Magnesium L-Threonate is a magnesium supplement that was clinically studied to help support healthy cognitive function and mental sharpness in 12 weeks(1)
  • Magnesium supports muscle relaxation, heart, nerve and bone health, and healthy aging; provides 130 mg of Magnesium from 1800 mg Magnesium L Threonate
  • Magnesium helps support the production of Melatonin
  • These gluten free Magnesium L-Threonate capsules have no artificial flavors; Adults, take 3 capsules daily
  • Made in the USA with quality global ingredients; #1 Pharmacist Recommended Vitamin and Supplement Brand*
  • These statements have not been evaluated by the Food and Drug Administration; this product is not intended to diagnose, treat, cure, or prevent any disease
9.1
Superb
Save 19%
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5
9.0
Superb
Magnesium L Threonate, Magtein, Sleep and Cognitive Support – High Absorption – Most Bioavailable Form of Magnesium – 2,000 mg – 120 Capsules
Double Wood Supplements

Magnesium L Threonate, Magtein, Sleep and Cognitive Support – High Absorption – Most Bioavailable Form of Magnesium – 2,000 mg – 120 Capsules

Why we love it
  • Clinically proven brain support.
  • Enhances cognitive health efficiently.
  • High absorption for optimal results.
Main Highlights
  • ONLY FORM OF MAGNESIUM ABLE TO SUPPORT MAGNESIUM LEVELS IN THE BRAIN: Magtein Magnesium L-Threonate is a unique magnesium breakthrough supplement and the only form of magnesium clinically proven to support magnesium levels in the brain
  • CLINICALLY STUDIED FOR COGNITIVE WELLNESS: Magnesium L-Threonate has been studied for its role in supporting memory, learning, and overall cognitive performance.
  • HIGHLY BIOAVAILABLE FORM OF MAGNESIUM: L-Threonate is a mineral chelating agent that is able to greatly enhance the bioavailability of magnesium making it highly absorbable
  • MAGNESIUM FOR SLEEP: Magnesium Threonate is commonly taken alongside L-Theanine and Apigenin in a sleep cocktail for nighttime assistance
  • WE BOTTLE WELLNESS: At Double Wood we provide pure, potent supplements that deliver exceptional value, all backed by careful sourcing and rigorous third-party testing
9.0
Superb
Amazon Logo
6
8.9
Excellent
Life Extension Neuro-Mag Magnesium L-Threonate, Memory Health, Quick Thinking, Cognitive Health Support, Vegetarian, Non-GMO, 90 Vegetarian Capsules (144 mg from 2000 mg Magtein magnesium L-threonate
Life Extension

Life Extension Neuro-Mag Magnesium L-Threonate, Memory Health, Quick Thinking, Cognitive Health Support, Vegetarian, Non-GMO, 90 Vegetarian Capsules (144 mg from 2000 mg Magtein magnesium L-threonate

Why we love it
  • Supports quick thinking abilities.
  • Enhances short-term memory function.
  • Promotes overall cognitive health.
Main Highlights
  • Quick thinking: Want to stay sharp? Try magnesium L-threonate: this form of magnesium helped maintain executive function and “quick thinking” in clinical studies.
  • Short-term memory: magnesium L-threonate helps support your working or “short term” memory health, so you don’t forget where you put your car keys, etc.
  • Cognitive health: magnesium plays an important role in your brain, supporting cognitive function. Magnesium L-Threonate is a special form of magnesium well-studied for cognitive health.
  • Ingredients matter – We use the finest raw ingredients chosen for quality and purity. The majority of our products are non-GMO, gluten-free and manufactured in the USA with globally sourced ingredients, and a Certificate of Analysis is available for each.
  • Live your healthiest life - For over 40 years, we’ve been developing advanced, effective formulas made with the highest standards and based on the latest scientific findings. We believe the answers to a healthier, richer life are within reach, and that rigorous scientific research is the path to get us there. That’s why so many of our nutritional formulas are designed using specific ingredients and amounts based on scientific studies.
8.9
Excellent
Amazon Logo
7
8.7
Excellent
Sports Research® Magnesium L-Threonate Capsules 2000mg - High-Absorption Magtein® for Enhanced Brain Health, Memory, Focus & Restful Sleep Support - Vegan · Non-GMO · Gluten Free - 90 Count
Sports Research

Sports Research® Magnesium L-Threonate Capsules 2000mg - High-Absorption Magtein® for Enhanced Brain Health, Memory, Focus & Restful Sleep Support - Vegan · Non-GMO · Gluten Free - 90 Count

Why we love it
  • Supports brain health and cognition.
  • Made with patented Magtein formula.
  • High-quality, non-GMO ingredients used.
Main Highlights
  • HIGHLY BIOAVAILABLE FORM: Magnesium L-threonate is the salt formed from mixing magnesium and threonic acid, a water-soluble substance derived from the metabolic breakdown of vitamin C. Easily absorbed, our magnesium L threonate capsules are used for their overall brain health benefits and may help support memory, focus, relaxation, mood, and cognition.
  • MADE WITH MAGTEIN: Magtein is a patented compound called threonic acid developed by a group of MIT researchers. Magtein is the only form that effectively crosses the blood-brain barrier and increases magnesium levels in the brain, which is critical for improving cognitive function. Our easy-to-swallow Magtein magnesium L-threonate veggie capsules are the easiest, most convenient way to add this essential mineral to your daily diet.
  • PREMIUM QUALITY: Sports Research takes pride in offering products that use only the best ingredients available so that you can have total peace of mind in the supplements that you are taking. Our magnesium supplement is verified non-GMO and free of gluten and gelatin.
  • MANUFACTURED IN THE USA: Our products are made in cGMP compliant facilities in the United States, using only the best ingredients from domestic & international origins. For us, it's all about quality control - so you can have confidence in your dietary supplements. We offer ninety (90) magnesium pills for a one (1) month supply. Reap all the benefits of this powerful and healthy magnesium threonate supplement!
  • THE SPORTS RESEARCH DIFFERENCE: Created in 1980, Sports Research is a privately-owned business born from a passion for fitness, wellness, and healing. Our goal is to help people live their best lives through real, research-backed ingredients created for every body — inside and out.
8.7
Excellent
Amazon Logo
8
8.7
Excellent
Magnesium L Threonate, Magtein, Brain Supplement for Memory, Focus, Sleep and Cognitive Support, High Absorption Magnesium L-Threonate, Non-GMO, No Laxative Effect – 2,000 mg, 120 Vegan Capsules
Teraputics

Magnesium L Threonate, Magtein, Brain Supplement for Memory, Focus, Sleep and Cognitive Support, High Absorption Magnesium L-Threonate, Non-GMO, No Laxative Effect – 2,000 mg, 120 Vegan Capsules

Why we love it
  • High absorption for brain health.
  • Developed by experts at MIT.
  • Supports memory and cognitive function.
Main Highlights
  • MOST SUPERIOR FORM OF MAGNESIUM: Magnesium L-Threonate is the only high absorption Magnesium vitamin that’s been shown to effectively raise concentrations of Magnesium in the brain
  • PATENTED MAGNESIUM: Developed by doctors at MIT, L-Threonate is a mineral chelated agent that is able to greatly enhance the bioavailability of Magnesium supplements, making them highly absorbable
  • PROMOTES MEMORY AND OVERALL COGNITIVE FUNCTION: Research has shown that Magtein Magnesium L-Threonate improved recall, slowed age-related memory decline, and helped create new neural pathways
  • FROM THE USA: Formulated right here in the USA in an FDA registered and GMP compliant facility; this complex undergoes testing two times by a third party to meet maximum purity and quality standards
8.7
Excellent
Amazon Logo
9
8.7
Excellent
Qunol Q-Mag Magnesium L-Threonate Tablets, 2000mg of Magtein to Help Support Cognitive Performance, Improve Mental Alertness & Productivity, Supports Restful Sleep, High Absorption, 60 Count
Qunol

Qunol Q-Mag Magnesium L-Threonate Tablets, 2000mg of Magtein to Help Support Cognitive Performance, Improve Mental Alertness & Productivity, Supports Restful Sleep, High Absorption, 60 Count

Why we love it
  • Enhanced mental alertness benefits.
  • Supports cognitive performance effectively.
  • Promotes a healthy stress response.
Main Highlights
  • 2000MG OF MAGTEIN MAGNESIUM L-THREONATE PROVIDING 144MG OF ELEMENTAL MAGNESIUM: Qunol Q-Mag features Magnesium L-Threonate, a clinically studied ingredient shown to help improve mental alertness and productivity*
  • PROMOTES COGNITIVE PERFORMANCE: Magnesium L-Threonate supports overall brain performance and working memory*
  • HEALTHY STRESS RESPONSE SUPPORT: Magnesium supports positive mood and a healthy response to occasional stress*
  • EASY TO SWALLOW COATING: For a simple, easy 2 tablet serving
  • CAFFEINE AND STIMULANT-FREE: Mental alertness and productivity without the buzz
8.7
Excellent
Amazon Logo
10
8.7
Excellent
Kappa Nutrition Powered by Magbrain™ Magnesium L-Threonate Plant-Based, 90 Vegan Capsules, 420mg Elemental Magnesium (3 Capsules) from 2,253mg, Brain, Sleep & Muscle Support.
KAPPA NUTRITION

Kappa Nutrition Powered by Magbrain™ Magnesium L-Threonate Plant-Based, 90 Vegan Capsules, 420mg Elemental Magnesium (3 Capsules) from 2,253mg, Brain, Sleep & Muscle Support.

Why we love it
  • Supports memory and cognitive function.
  • Enhances sleep quality and relaxation.
  • Promotes energy and muscle support.
Main Highlights
  • High-Potency Magnesium L-Threonate Plant-Based. Manufactured in Texas, USA. Each 3-capsule serving provides 420 mg elemental magnesium (280 mg per 2 capsules).
  • Supports Brain Function & Mental Clarity. Helps maintain healthy magnesium levels in the brain to support memory, focus, and cognitive performance.
  • Promotes Relaxation & Restful Sleep. Supports GABA and melatonin pathways to encourage calmness and healthy sleep cycles.
  • Muscle, Energy & Recovery Support. Plays a role in ATP energy production, neuromuscular function, and post-exercise recovery.
  • Bone & Heart Health + Quality Assurance. Supports bone density and cardiovascular wellness. Made in a cGMP-certified facility and third-party tested for purity, heavy metals, and label accuracy.
8.7
Excellent
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Related Deals You Might Like for Magnesium Threonate Supplement

📊We scanned 1886 products
🔍
We reviewed the most relevant Magnesium Threonate Supplement offers across Amazon and leading retailers, covering major brands and models. Our shortlist features trusted names like Sports Research, Metagenics, NOW Foods, Nature Made, Double Wood Supplements, Life Extension, Teraputics, Qunol, KAPPA NUTRITION, known for dependable quality and smart design.
⭐
To determine today's best Magnesium Threonate Supplement, we analyzed 9431 real customer and expert reviews, focusing on satisfaction, real-world performance and long-term reliability. We also weigh each review's relevance, authenticity and freshness for a fair comparison.

Here's what we found:

🏆 #1
Sports Research® Magnesium L-Threonate Capsules 2000mg - High-Absorption Magtein® for Enhanced Brain Health, Memory, Focus & Restful Sleep Support - Vegan · Non-GMO · Gluten Free - 180 Count

Our overall winner is Sports Research® Magnesium L-Threonate Capsules 2000mg - High-Absorption Magtein® for Enhanced Brain Health, Memory, Focus & Restful Sleep Support - Vegan · Non-GMO · Gluten Free - 180 Count by Sports Research. It stands out for the right balance of quality, performance and value.

✨ What sets it apart:
✓Supports brain health benefits.
✓Easy absorption for enhanced cognition.
✓Made with premium quality ingredients
💎 Best Value
Metagenics Magnesium L-Threonate - Magtein Magnesium for Brain Health, Memory, Learning & Cognitive Support - Clinically Studied Bioavailable Form - Non-GMO, Gluten-Free, Vegan - 120 Capsules

The best value for most shoppers is Metagenics Magnesium L-Threonate - Magtein Magnesium for Brain Health, Memory, Learning & Cognitive Support - Clinically Studied Bioavailable Form - Non-GMO, Gluten-Free, Vegan - 120 Capsules by Metagenics, with consistently high satisfaction across expert and customer reviews.

💰 Best Deal
Nature Made Magnesium L-Threonate with Vitamin C & Vitamin D3, Provides 130 mg of Mag from 1800 mg Magnesium L Threonate, Cognitive Support Magnesium Supplement, 90 Capsules, 30 Day Supply

The strongest deal right now for Magnesium Threonate Supplement is Nature Made Magnesium L-Threonate with Vitamin C & Vitamin D3, Provides 130 mg of Mag from 1800 mg Magnesium L Threonate, Cognitive Support Magnesium Supplement, 90 Capsules, 30 Day Supply at Nature Made, currently at 19% off.

🔄Our Magnesium Threonate Supplement ranking is updated regularly to reflect new releases and price changes—check back for the latest picks and deals.