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Magnesium L-Threonate 2000mg | Brain & Sleep Support

Magnesium built for the brain. Magnesium L-threonate is the form developed to cross the blood-brain barrier, supporting memory, focus, a calm mind and deep, restorative sleep. 2,000 mg per serve, 90 vegetable capsules, 30-day supply.

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Ingredients

Suggested Use

Magnesium L-threonate (often written magnesium threonate, or sold as Magtein®) is magnesium bound to L-threonate, a metabolite of vitamin C. Unlike common forms such as oxide, citrate or glycinate, which raise blood magnesium but barely move brain magnesium, magnesium L-threonate was specifically developed to cross the blood-brain barrier and raise magnesium levels inside the brain, where it supports synaptic density, healthy neuronal signalling and the ability to switch off at night. Each 2,000 mg serve delivers the full amount used in the 12-week clinical trial, in three easy vegetable capsules.
Magnesium is a cofactor in more than 300 enzyme systems and a natural gatekeeper of the NMDA receptor, the switch behind learning and memory. The L-threonate carrier is what sets this form apart: it is actively transported across the blood-brain barrier, lifting magnesium in cerebrospinal fluid and brain tissue in a way other forms have not matched in research. Higher brain magnesium supports synapse formation, calms over-excited neuronal firing, and helps regulate the neurotransmitters and circadian signals that let you fall asleep easily and wake refreshed.
The form studied for raising magnesium levels inside the brain
Clinically studied for memory, executive function and focus
Shown in a 2024 randomised trial to support sleep quality and daytime energy
Supports the NMDA receptors and synaptic density behind learning
Professionals and students who want sharper focus and recall
Adults over 40 supporting memory and long-term brain health
Anyone who struggles to switch off and sleep deeply
People who found other magnesium forms did nothing for the mind
Magnesium L-Threonate (MMFS-01) and Cognitive Function in Older Adults: A Randomised, Double-Blind, Placebo-Controlled Trial
Year: 2016 • 44 adults aged 50–70 • Duration: 12 weeks • Randomised controlled trial
1.5–2 g of magnesium L-threonate daily significantly improved a composite measure of overall cognitive ability versus placebo, with the clearest gains in executive function and working memory; brain-age modelling suggested a reduction of roughly nine years in functional brain age. View on PubMed →
Magnesium-L-Threonate Improves Sleep Quality and Daytime Functioning in Adults With Self-Reported Sleep Problems: A Randomised Controlled Trial
Year: 2024 • 80 adults with self-reported sleep problems • Duration: 21 days • Randomised controlled trial
1 g of magnesium L-threonate daily improved sleep quality, deep and REM sleep measured by wearable, and daytime energy, mood and focus compared with placebo. View on PubMed →
A Magtein®, Magnesium L-Threonate-Based Formula Improves Brain Cognitive Functions in Healthy Chinese Adults
Year: 2022 • Healthy adults • Duration: 30 days • Randomised controlled trial
A magnesium L-threonate-based formula improved scores across multiple cognitive domains, including memory and processing speed, compared with placebo over 30 days. View on PubMed →
Enhancement of Learning and Memory by Elevating Brain Magnesium (Neuron)
Year: 2010 • Rats • Preclinical study
Magnesium L-threonate raised magnesium levels in cerebrospinal fluid and brain tissue, increased synaptic density and improved learning and memory, results that other magnesium forms did not match. View on PubMed →
Studies describe the ingredient in the populations shown; results vary between individuals. Links open the original abstracts on PubMed.

Frequently Asked Questions

Everything you need to know about our premium supplements

Most magnesium forms (oxide, citrate, glycinate) are absorbed into the bloodstream but struggle to cross the blood-brain barrier, so brain magnesium barely moves. Magnesium L-threonate pairs magnesium with L-threonate, a vitamin C metabolite that is actively transported into the brain. In research it is the form shown to meaningfully raise magnesium levels in brain tissue, which is why it is the form studied for memory, focus and sleep rather than muscle cramps or digestion.

Each three-capsule serve contains 2,000 mg of magnesium L-threonate, the compound used in the clinical trials. Magnesium L-threonate is about 7% elemental magnesium by weight, so that works out to approximately 144 mg of elemental magnesium per serve. The label lists the compound weight, which is the figure used in the research. If you also take another magnesium supplement, count both towards your daily total.

Take three capsules daily with a meal. If sleep is your priority, take all three in the evening, one to two hours before bed. If you want daytime focus, split the serve: two capsules with breakfast and one in the evening. Consistency matters more than timing; the benefits seen in trials built up over several weeks of daily use.

Sleep changes are usually the first thing people notice, often within the first one to three weeks. In a 2024 randomised trial, adults with self-reported sleep problems reported better sleep quality and daytime functioning after 21 days. Cognitive benefits take longer: the 12-week trial in older adults measured improvements at 6 and 12 weeks. Give it a full bottle (30 days) before judging, and ideally three months of consistent use.

Yes. It pairs naturally with NMN for cellular energy and with Korean Red Panax Ginseng or Methylene Blue for daytime focus, and it makes a sensible evening anchor for any longevity routine. Because the L-threonate carrier is gentle on the gut, it is far less likely to cause the digestive upset associated with magnesium oxide or citrate. If you take prescription medication, speak with your healthcare professional first.

Yes. The only ingredients are magnesium L-threonate, a vegetable capsule and rice flour, with no artificial fillers, colours or preservatives, so it is suitable for vegans and vegetarians.

It is intended for adults. Do not use if pregnant or breastfeeding unless your doctor advises it, and check with your healthcare professional first if you have a kidney condition or take medication, as magnesium can interact with some antibiotics, bisphosphonates and diuretics. Stop use and consult your doctor if you experience any adverse reaction.

Each bottle contains 90 vegetable capsules. At the labelled serving of three capsules a day, that is 30 servings: a full 30-day supply. Choose two bottles to save 10%, three to save 15% or five to save 20%; your bundle price is shown above and applied in your cart.

Yes. Every batch is independently tested by an accredited third-party laboratory for identity, potency and purity, including heavy metals and microbial contaminants, and manufactured in a GMP-certified facility. A current certificate of analysis for your batch is available on request.

Yes. We ship to every Australian state and territory from our Sydney warehouse, so you can buy magnesium L-threonate in Australia without importing it. Orders over $100 ship free, and orders are dispatched within 24 hours on business days. Every order is covered by our 30-day money-back guarantee.

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