10 Best Magnesium Threonate of 2026

Last updated on 04/03/2026
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Best Choice
1
9.7
Exceptional
Momentous Magtein Magnesium L-Threonate - Brain & Rest Support Supplement - Boosts Cognitive Function & Sleep Quality - NSF Certified for Sport -145 mg - 30 Servings
Momentous

Momentous Magtein Magnesium L-Threonate - Brain & Rest Support Supplement - Boosts Cognitive Function & Sleep Quality - NSF Certified for Sport -145 mg - 30 Servings

Why we love it
  • Elevates cognitive function effectively.
  • Promotes quality sleep recovery.
  • Certified safe for athletes.
Main Highlights
  • Elevates Cognitive Function - Harness the power of magnesium L-threonate to help increase magnesium levels in the brain, which may promote overall brain health. Our powerful formula supports cognitive function including memory, learning, attention, & focus.
  • Promotes Quality Rest - Unlock the unique capability of Magtein magnesium L-threonate, the only form of magnesium demonstrated to penetrate the blood-brain barrier. By increasing blood flow to the brain, it supports quality rest for optimal recovery during sleep.
  • Enhances Function - Momentous magnesium L-threonate supplements help to facilitate muscle contraction, regulate blood pressure, & synthesize DNA & proteins. They also aid in the transmission of nerve signals, regulate neurotransmitter levels, & fuel energy production in brain cells.
  • Optimal Dosage, Optimal Results - In order to harness the full benefits of our magnesium L-threonate supplement, take 3 capsules 30-60 minutes before bedtime to promote restful sleep & energize the next day’s daily demands & activities.
  • Certified for Athletes - Providing products that give you peace of mind knowing that you’re making smart choices. High quality, research-backed ingredients, chosen by our world-class product engineers.
9.7
Exceptional
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🛡️Trusted by 100M+ UsersWhy?
Best Value
2
9.6
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
9.6
Superb
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3
9.6
Superb
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.
9.6
Superb
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4
9.6
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
9.6
Superb
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5
9.4
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
9.4
Superb
Save 19%
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6
9.3
Superb
Nutricost Magnesium L-Threonate As Magtein 2000mg, 120 Capsules - Non-GMO, Gluten Free, Vegetarian Friendly
Nutricost

Nutricost Magnesium L-Threonate As Magtein 2000mg, 120 Capsules - Non-GMO, Gluten Free, Vegetarian Friendly

Why we love it
  • High potency magnesium support.
  • Convenient 40 servings available.
  • Third-party tested for quality.
Main Highlights
  • 2,000mg Of Magnesium L-Threonate In Each Serving
  • 40 Servings Per Bottle (3 Capsules Per Serving)
  • Made With Magtein
  • Non-GMO, Gluten Free, And Vegetarian Friendly
  • 3rd Party Tested by ISO-accredited Laboratories
9.3
Superb
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7
9.2
Superb
MegaFood Magtein Magnesium L-Threonate - Magnesium Supplement 2000mg Per Serving - Supports Short-Term Memory, Focus, Alertness & Normal Sleep Cycles - Vegan, Gluten Free - 90 Capsules, 30 Servings
MegaFood

MegaFood Magtein Magnesium L-Threonate - Magnesium Supplement 2000mg Per Serving - Supports Short-Term Memory, Focus, Alertness & Normal Sleep Cycles - Vegan, Gluten Free - 90 Capsules, 30 Servings

Why we love it
  • Enhances memory and focus.
  • Promotes better sleep quality.
  • Vegan and allergen-free formula.
Main Highlights
  • MAGNESIUM FOR SLEEP & COGNITIVE SUPPORT: Offering 2000 mg of Magnesium Threonate per serving, this formula enhances short-term memory (2), sharpens focus (2) and attention, and promotes mental alertness; Magnesium also supports a normal sleep cycle+
  • CLINCALLY STUDIED INGREDIENT: This Megafood Magnesium product is formulated with Magtein (1), a clinically studied type of Magnesium that has been shown to offer multi-benefit cognitive support+
  • HIGHLY BIOAVAILABLE MAGNESIUM & MADE WITH REAL FOOD: Formulated with L-Threonate to help increase the brain's Magnesium levels, which is crucial to supporting cognitive function; Paired with 100 mg of blueberries per serving, a natural source of polyphenols known for their antioxidant benefits+
  • TAKE ANY TIME OF DAY: Adults take three capsules any time of day with food and a beverage; Bottle contains 90 capsules for 30 servings
  • FREE FROM COMPROMISE: Vegan, Gluten Free, tested for 150 chemical substances, GMP quality assured, and made without the nine top food allergens including milk, eggs, peanuts, tree nuts, soy, wheat, fish, shellfish, and sesame
9.2
Superb
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8
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
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9
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
10
8.8
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.
8.8
Excellent
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Related Deals You Might Like for Magnesium Threonate

📊We scanned 1203 products
🔍
We reviewed the most relevant Magnesium Threonate offers across Amazon and leading retailers, covering major brands and models. Our shortlist features trusted names like Momentous, Metagenics, Sports Research, NOW Foods, Nature Made, Nutricost, MegaFood, Double Wood Supplements, Life Extension, known for dependable quality and smart design.
⭐
To determine today's best Magnesium Threonate, we analyzed 6016 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
Momentous Magtein Magnesium L-Threonate - Brain & Rest Support Supplement - Boosts Cognitive Function & Sleep Quality - NSF Certified for Sport -145 mg - 30 Servings

Our overall winner is Momentous Magtein Magnesium L-Threonate - Brain & Rest Support Supplement - Boosts Cognitive Function & Sleep Quality - NSF Certified for Sport -145 mg - 30 Servings by Momentous. It stands out for the right balance of quality, performance and value.

✨ What sets it apart:
✓Elevates cognitive function effectively.
✓Promotes quality sleep recovery.
✓Certified safe for athletes.
💎 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 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 ranking is updated regularly to reflect new releases and price changes—check back for the latest picks and deals.