10 Best Magnesium L Threonate 500mg of 2026

Tested and Reviewed: Top 10 Magnesium L Threonate 500mg deals with expert ratings from 8.1 to a perfect 10

June 2026 Edition

Editor's Choice

9.7

Double Wood Supplements

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

Editor's bottom line:

“This magnesium l threonate 500mg is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

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

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Picked by 397 people today

9.5

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

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 dont 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, weve 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. Thats why so many of our nutritional formulas are designed using specific ingredients and amounts based on scientific studies.

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9.5

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

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.

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9.2

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

Main Highlights

MOST SUPERIOR FORM OF MAGNESIUM: Magnesium L-Threonate is the only high absorption Magnesium vitamin thats 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

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Best Value

9.0

Save 33%

LIFE CAPX

LIFE CAPX Magnesium L-Threonate Capsules, Original Patented Magtein™ Form of Magnesium (Mg), Improve Memory, Cognition and Sleep Quality (90 Capsules)

33% Off

Main Highlights

[ENSURE OPTIMAL MAGNESIUM LEVELS] Magnesium plays a crucial role in helping brain health; however, it is often deficient in diets. Incorporating high-absorption magnesium supplement can effectively complement brain-friendly lifestyle choices.
[HIGHEST BIOAVAILABLE FORMULATION] Magtein has been meticulously designed to maximize magnesium absorption, allowing a higher amount of magnesium to penetrate the blood-brain barrier. This innovative formulation not only boosts energy levels but also promotes healthy digestion, improves sleep quality, and reduces fatigue.
[ENHANCED COGNITIVE FUNCTION] Extensive studies have proven that Magtein significantly elevates magnesium levels in the brain, leading to improvements in learning capacity, short- and long-term memory, working memory, and synaptic connections.
[OPTIMIZE COGNITIVE PERFORMANCE] The magnesium threonate cognitive supplement is meticulously crafted to preserve the vital connections between brain cells, ensuring memory remains razor-sharp even amidst life's demands.
[LIFE CAPX COMMITMENT] Made by GMP facility in the USA with highest grade globally sourced ingredients. Our commitment to quality extends to what we exclude from our products. LIFE CAPX ensures freedom from common allergens, artificial or unnecessary ingredients, and GMOs

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8.8

Save 20%

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

20% Off

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

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8.6

AMANDEAN

AMANDEAN Magtein Magnesium Complex. L-Threonate, Glycinate, Malate Triple Blend Chelated Magnesium Supplement. 90 Veggie Capsules. High Absorption Branded Ingredients. Brain Health, Sleep, Calm*.

Main Highlights

Unlock Your Brain's Potential: Our Magnesium L-Threonate Complex with Magtein is clinically shown to cross the blood-brain barrier and support cognitive function for early brain development & old age.*
3-in-1 Formula for Maximum Benefits: Our high absorption magnesium triple complex is blended with bisglycinate chelate + DiMagnesium malate (both Albion TRAACS) in an easy-to-swallow veggie capsule for 270mg of elemental magnesium per dose. (3 capsules). This is nearly twice the dosage of a straight Magtein product. There are no added stearates or silica, unlike other brands.
Sleep Better, Feel Better: Our magnesium supplement can help improve the quality of sleep by relaxing the central nervous system that regulates melatonin and GABA. Increased levels of magnesium support healthy sleep cycles. The amino acid glycine also promotes restful and quality sleep, as well as reduced stress and relaxation.*
Energy, Bones, & Muscle Recovery: Daily magnesium intake helps to boost energy at a cellular level, improve physical performance, exercise recovery, and muscle cramping. Healthy levels contribute to bone density & strength, critical for healthy aging. Mag is vital for the absorption of essential minerals in the body.*
Quality You Can Trust: Amandean uses only the highest quality premium ingredients. All three forms of magnesium are patented and have many clinical studies behind them. Clean Non-GMO ingredients that are 3rd party lab-tested & packaged at a cGMP facility for purity & safety. Contains no artificial flavors, preservatives, or stearates. 90-day satisfaction guarantee.

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8.3

Yalei

Magnesium L-Threonate 2,000mg and Magnesium Glycinate 400mg | 90 Vegetarian Capsules | Muscle Health, Better Sleep & Cognitive Health|High-Absorption | Non-GMO, Gluten-Free

Main Highlights

Non GMO, 100% vegan,Gluten-Free
Precise Element Combination: Each element is a precise unit required by the human body, scientifically proportioned, and formulated with a warm and easy to absorb formula.
2000mg Magnesium L-ThreonateEnhance the absorption and utilization rate of magnesium element, assist in reducing muscle spasms, and improve muscle recovery after exercise.
100mg PhosphatidylserinePhospholipids naturally present in human cell membranes. Supporting cognitive function, relieving stress, and delaying brain aging are important components in maintaining neurological health.
400mg Magnesium Glycinate:Magnesium is an essential mineral for the human body, with its core function being to maintain normal nerve and muscle function. It is a "key assistant" for energy metabolism and bone health.
High Quality and Healthy Each batch of products complies with GMP standards and undergoes laboratory testing to ensure quality and safety

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8.1

KAPPA NUTRITION

Kappa Nutrition Powered by Magbrain™ Magnesium L-Threonate Plant-Based, 420mg Elemental Magnesium (3 Capsules) from 2,253mg, 120 Vegan Capsules, Brain, Sleep & 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.

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8.1

NOW Foods

NOW Foods Supplements, Magtein™ with patented form of Magnesium (Mg), Cognitive Support*, 90 Veg Capsules

Main Highlights

2 grams of Magnesium L-Threonate for cognitive support*
A patented form of magnesium that readily crosses the blood-brain barrier for utilization in the brain*
Take 3 capsules daily. Best when taken in divided doses (take 1 capsule in the morning and take 2 capsules two hours before sleep).
Supports brain health and may facilitate learning and memory, as well as a relaxed mood*
Made and quality tested in the USA with globally sourced ingredients*
Founded in 1968 by Elwood Richard, NOW is one of the largest independent, family- and employee-owned manufacturers of natural products

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Our Best Overall Choice

Best Choice

9.7

Double Wood Supplements

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

Editor's bottom line:

“This is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

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

Show Price

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