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Magnesium L-Threonate (Magtein) Supplement

$ 30.95

Magnesium L-Threonate enhances brain magnesium levels, promoting cognitive health and helping you stay sharp and focused.
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Description

Magnesium is an essential mineral involved in hundreds of processes throughout the body. While there are many forms of magnesium available, Magnesium L-Threonate is unique because it is designed to support brain magnesium levels. This makes it a strong choice for those looking to support cognitive health, focus, and overall brain function.

Each 4-capsule serving provides 2,000 mg of Magtein® Magnesium L-Threonate, yielding 144 mg of elemental magnesium.


Soy-Free, Gluten-Free, Non-GMO

Benefits
  • ONLY FORM OF MAGNESIUM ABLE TO SUPPORT MAGNESIUM LEVELS IN THE BRAIN: Magtein Magnesium L-Threonate is a magnesium breakthrough supplement and the only form of magnesium clinically proven to support magnesium levels in the brain
  • CLINICALLY STUDIED FOR COGNITIVE HEALTH: Multiple clinical studies show Magnesium L Threonate can help support cognitive health
  • 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 (treonato de magnesio)
  • 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

Directions & Dosage

Clinical studies of Magtein® used 1.5–2 g per day. Most adults take 4 capsules (2 g) daily, split between morning and 2 hours before bed.

The Science Behind Magtein (Magnesium L-Threonate)

Magtein® Magnesium L-Threonate has been studied for its ability to support brain magnesium levels, cognitive performance, and sleep quality. For a deeper breakdown of the studies, doses, durations, and outcomes, visit our Magtein® Magnesium L-Threonate research page.

In a 2016 randomized, double-blind, placebo-controlled trial by Liu et al., researchers studied MMFS-01, a magnesium L-threonate formula, in adults aged 50–70 with cognitive impairment and observed improvements in measures of cognitive ability over 12 weeks.

A randomized, double-blind, placebo-controlled trial by Lopresti and Smith studied 2 g per day of Magtein® in 100 adults aged 18–45 with self-reported dissatisfied sleep over 6 weeks, evaluating cognitive performance, cognitive age, sleep quality, and related physiological markers.

The original 2010 Neuron study by Slutsky et al. helped establish the mechanism behind magnesium L-threonate, showing in animal research that increasing brain magnesium was associated with improvements in learning, working memory, short-term memory, long-term memory, and synaptic density.

View Latest Test Results

Third-party tested for quality and purity

This production lot was tested for ingredient potency, elemental magnesium, capsule weight, disintegration, heavy metals, and microbial quality.

Test Claim or Limit Result
Potency
Magnesium L-Threonate (Magtein®) 1,800–2,500 mg 2,542.4 mg
Elemental Magnesium 129.6–180 mg 162.3 mg
Physical Testing
Capsule Weight 717–753 mg 735 mg
Disintegration Not more than 30 minutes Passed
Heavy Metals
Arsenic <10 µg/serving 0.147 µg/serving
Cadmium <4.1 µg/serving 0.029 µg/serving
Lead <0.5 µg/serving 0.235 µg/serving
Mercury <0.3 µg/serving 0.059 µg/serving
Microbial Testing
Total Plate Count <10,000 CFU/g Passed
Total Yeast & Mold Count <1,000 CFU/g Passed
E. coli Absent Passed
Salmonella spp. Absent Passed
Staphylococcus aureus Absent Passed

Lot: 2532202Manufactured: 01/2025

Lab: Brand Nutraceuticals, Inc.

View Certificate of Analysis (PDF)

See the original Certificate of Analysis for complete testing details, methods, and laboratory documentation.
View Certificate of Analysis View Third Party Test Results
Identity, potency, and contaminants verified per batch Identity, potency, and contaminants verified per batch
Manufactured in an FDA-registered cGMP facility Manufactured in an FDA-registered cGMP facility
Manufactured in the USA from Gloabally Sourced Materials Manufactured in the USA from Gloabally Sourced Materials

Benefits

  • Highly Bioavailable Magnesium: Magnesium L-Threonate is uniquely formulated as a mineral chelating agent, enabling it to efficiently cross the blood-brain barrier and deliver elemental magnesium directly to the brain.
  • Supports Cognitive Health: Research demonstrates that Magnesium L-Threonate effectively increases brain magnesium levels, which is essential for maintaining and enhancing cognitive functions.
  • Enhances Sleep Quality: By promoting relaxation and supporting brain health, Magnesium L-Threonate may also contribute to healthier sleep patterns, helping you achieve more restful and rejuvenating sleep.
Benefits

Magtein (Magnesium L-Threonate)

A patented form of magnesium L-threonate. As a dietary nutrient, it is found in foods and may complement an everyday nutrition routine. It is commonly chosen to studied for supporting cognitive function and brain magnesium levels.

Magtein (Magnesium L-Threonate)

What Customers Are Saying

Reviews

"I take two capsules an hour before bedtime and it helps me fall asleep quickly and stay asleep. I won’t be without it."

Gayle D.

"Love that it crosses the blood brain barrier and is neuro protective and helps me sleep better."

Jennifer R.

"Love this product! My family takes this for relaxation and to ensure good sleep quality. Highly recommend!"

Anna N.

See All Reviews
Reviews
Supplement Facts

Pairs well with

Powerful alone, stronger together. Magnesium L-Threonate (Magtein) Supplement delivers targeted support on its own, but combining it with complementary ingredients can help create a more holistic and balanced approach to wellness.

  • Apigenin Supplement

    Apigenin supports overall wellness with its natural antioxidant properties, found abundantly in chamomile tea.

  • Alpha GPC Supplement

    Alpha GPC supports cognitive health by providing choline, a key nutrient for brain function and memory enhancement.

Frequently Asked Questions

How many mg of elemental magnesium are in Double Wood’s Magnesium L-Threonate?

Each 4-capsule serving of Double Wood Magnesium L-Threonate provides 2,000 mg of Magtein® Magnesium L-Threonate, yielding 144 mg of elemental magnesium. This two-part dose matters because “Magtein®” refers to the full magnesium L-threonate compound, while “elemental magnesium” refers to the actual magnesium content delivered per serving.

How much Magtein® Magnesium L-Threonate should you take?

Clinical studies on Magtein® Magnesium L-Threonate have typically used 1.5–2 g per day, with many adult studies using a 2 g daily dose. Double Wood Magnesium L-Threonate is designed to match that research-backed serving size: each 4-capsule serving provides 2,000 mg of Magtein® Magnesium L-Threonate, yielding 144 mg of elemental magnesium.

For most adults, the suggested serving is 4 capsules daily, often split between morning and evening. Some people prefer starting with 2 capsules for the first week to assess tolerance, then increasing to the full 4-capsule serving. Always follow the label directions and consult your healthcare provider if you are pregnant, nursing, taking medication, or managing a medical condition.

What’s the difference between magnesium L-threonate and Magtein®?

Magnesium L-threonate is a form of magnesium bound to L-threonic acid. Magtein® is the patented, clinically studied form of magnesium L-threonate used in research on brain magnesium levels, cognitive performance, and sleep quality. Double Wood Magnesium L-Threonate is made with Magtein®, not a generic magnesium L-threonate ingredient.

Can you take Magtein® every day long-term?

Magtein® Magnesium L-Threonate is commonly taken daily as part of a long-term cognitive health or sleep-support routine. Clinical studies have evaluated daily use over multiple weeks, including 6- and 12-week study periods. Always follow the label directions, and consult your healthcare provider if you are pregnant, nursing, taking medication, or managing a medical condition.

Is Double Wood Magnesium L-Threonate third-party tested?

Yes. Every batch is independently assayed by an ISO/IEC 17025:2017-accredited laboratory (PJLA Accreditation No. 86258) in St. Petersburg, FL, with a Certificate of Analysis signed by Philias Daka, PhD, QA Manager. The most recent third-party report covers Lot 2430402, dated 02/21/2025, which verified 2,000 mg of Magnesium L-Threonate (Magtein) and 144 mg of elemental magnesium per 4-capsule serving by USP 38 Titration — both PASS. Every batch is also screened for identity, heavy metals (arsenic, cadmium, lead, mercury via ICP-MS), and microbial contamination (Total Plate Count, Yeast & Mold, Coliform, E. coli, Salmonella, Staphylococcus aureus). Manufactured in a cGMP-certified U.S. facility from globally sourced ingredients.

What does the Magnesium L-Threonate Certificate of Analysis confirm?

The COA confirms identity and potency of Magtein® patented magnesium L-threonate, with the active assay verified by titration against USP standards. The most recently published third-party assay (Lot 2430402, reported 02/21/2025) returned a PASS on both the 2,000 mg L-threonate spec and the 144 mg elemental magnesium spec per 4-capsule serving. The full COA panel also confirms heavy metals are below USP <2232> limits and microbial counts are within USP <2021>/<2022> specifications. The current batch COA and third-party test report are both linked above for verification against the lot number printed on your bottle.

Overall rating: 4.830601 / 5 from 732 reviews.

AI Generated Review Summary

Magnesium L-Threonate (Magtein) Supplement is highly regarded for its ability to enhance brain magnesium levels, supporting cognitive health. Customers appreciate its quality, effectiveness, and the noticeable difference it makes in blood pressure and circulation. The product is praised for its sleep-enhancing properties, excellent customer service, and fast, reliable shipping. It is also noted for its great price and soy-free, gluten-free, non-GMO formulation.

Summary topics

  • Effectiveness (4%): Customers raved about the quality and effectiveness of the products, with no negative reviews mentioned.
  • Product Quality (9%): Customers expressed satisfaction with the excellent quality of the product, which was mentioned multiple times in the reviews.
  • Noticeable Difference (4%): Customers expressed satisfaction with the noticeable difference in blood pressure and circulation after using this product.
  • Magnesium Quality (8%): Customers raved about this magnesium, stating it is the best they have ever used. However, some recommend taking a different type of magnesium.
  • Relaxation Effect (4%): Customers loved the product for its ability to make them feel relaxed and sleepy before going to bed.

Review topics: [improvement, results, quality, issues, value, feeling, benefits, price, husband, packaging, dose, work, energy, ingredients, stomach, shipping, pain, impact, difference, service, sleep, magnesium, supplement, effect, wood, order, magnesium l-threonate, capsules, clarity, cramps].

Review highlights

  • "Great products, outstanding support, excellent customer service, and competitive pricing!" — Feisal F.
  • "Best source of magnesium Great company and great price and service" — Anonymous
  • "Thank you for a high quality product plus fast shipping!" — Anonymous

Reviews

"Delivery was really fast I was surprised"

— Mike (5/5)

Foot and leg cramp help

"Take two a day and increased my liquid intake. Rarely have foot or leg cramps any more."

— Eliese M. (5/5)

"So far so good, just started it!"

— Jessica (5/5)

"So far so good, just started it."

— Jessica (5/5)

Slight improvement

"I sleep a little better and that’s hugely important. So far, no improvement on my memory… I sure hope that that will improve too!"

— Olga R. (3/5)

"Great protect!"

— Suzanne (5/5)

Health

"Product is easy to take and begins working shortly after taking."

— Ronald B. (5/5)

Great for sleep

"This is how I sleep at night!"

— Rachael F. (5/5)

"My ability to sleep through the night has improved."

— Sue (5/5)

"I ordered Berberine and got a bottle of something I didn’t order."

— Cheryl (1/5)

Q&A

Why can’t I find an other ingredient list?
Magtein® is the patented form of magnesium L-threonate, a compound combining magnesium with L-threonic acid, a metabolite of vitamin C. This unique formulation is designed to enhance magnesium&#x27;s ability to cross the blood-brain barrier, thereby supporting cognitive function. As for the inactive ingredients this product also contains vegetable stearate and rice flour as excipients
Just got my order of Magnesium L-Threonate...should it be taken with a meal or on an empty stomach?
Magnesium is not fat soluble so there is no need to take it with a meal.
When is best time ti take this? Can one take in the morning? As I already take mag glycinate at bedtime.
This answer can vary based on the individual. Most of our customers take it at night, due to the sleepy side effect. Since you are already taking Magnesium Glycinate you may want to check with your Dr to determine the best time take this supplement to maximize absorbency.
Does Magnesium L. thrednate come in a Gummie?
Not at this time.
Does gelatin in your product pork or beef?
Our gelatin capsules are bovine. We hope this helps!

Magnesium L-Threonate (Magtein) Supplement

From

$ 30.95

Primary Benefit

Sleep

Other Benefits

Anxiety & Stress, Brain Health

Product Form

Capsule
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