In 80 adults, 1 g a day for 21 days improved sleep quality, with more deep and REM sleep and better energy, mood and alertness the next day, versus placebo.
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Premium Quality
Magnesium L-Threonate 2000mg | Brain & Sleep Support
4.6 (18)
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- 90 capsules per bottle
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Why L-threonate
Magnesium built to reach the brain.
Common forms such as oxide, citrate and glycinate raise magnesium in the blood, but research has not shown them raising it in the brain. Magnesium L-threonate binds magnesium to L-threonate, a metabolite of vitamin C that is actively transported across the blood-brain barrier.
Inside the brain, magnesium is a natural gatekeeper of the NMDA receptor, the switch behind learning and memory. In the 2010 Neuron study, raising brain magnesium with L-threonate increased synapse density and improved learning and memory.
Each 2,000 mg serve matches the top of the daily dose range used in the 12-week clinical trial, in three vegetable capsules.
Compare the forms
Not all magnesium reaches the brain.
Most forms are made for everyday top-ups or digestion. L-threonate is the form shown to raise magnesium in the brain, and the one tested in human trials for memory and sleep. Swipe the table to compare.
| Property | Eternal ElixirL-Threonate | Oxide | Citrate | Glycinate |
|---|---|---|---|---|
| What it's made for | Brain magnesium: memory, focus and sleep | Cheap, high dose, often for constipation | Everyday magnesium | Everyday magnesium, gentle form |
| Reaches the brain | Raised brain magnesium Where other forms did not · Neuron, 2010 (lab study) | Not shown | Not shown | Not shown |
| Memory and focus | Better working memory and executive function 2016 and 2022 trials vs placebo | Not the focus | Not the focus | Not the focus |
| Sleep | More deep and REM sleep Plus next-day energy and focus · 2024 trial, 80 adults vs placebo | Not the focus | Not the focus | Popular for sleep, few trials |
What to expect
What to expect, week by week.
Sleep tends to shift first. Focus and recall build over the weeks after.
- Week 1
An easy daily habit
Three capsules a day with a meal.
- Weeks 1 to 3
Sleep shifts first
Easier to switch off, and you wake more refreshed.
- Day 21
Better nights, brighter days
More deep and REM sleep, and better next-day energy and mood in a 2024 trial.
- Weeks 6 to 12
Sharper focus and recall
Overall cognitive ability improved at 6 and 12 weeks in a 12-week trial.
The research
Studied for sleep, memory and focus.
One serve is 2 g, in line with the 1 to 2 g a day used in the human trials. Here is the clearest result, then three more.
After 12 weeks, "brain age" on a thinking test was 9.4 years younger, against 0.8 years on placebo
The adults in this trial had mild memory and concentration complaints. They took 1.5 to 2 g of magnesium L-threonate a day, and overall cognitive ability improved, most clearly in working memory and executive function.
Liu G et al. Journal of Alzheimer's Disease, 2016. Read the abstract →
Years younger in "brain age" after 12 weeks
In healthy adults, 30 days of magnesium L-threonate improved memory scores versus placebo.
Read the abstract →In rats, L-threonate raised magnesium in the brain where other forms did not, and that went with better learning and memory.
Read the abstract →
What's inside
One active ingredient, at the dose that was studied.
Magnesium L-threonate is magnesium bound to L-threonate, a compound your body makes when it breaks down vitamin C. Each serve is 2,000 mg in three vegetable capsules, with a little rice flour and nothing else.
The ingredientPlate I
Magnesium L‑Threonate
Magnesium bound to L-threonate · a vitamin C metabolite
Magnesium L-threonate · C8H14MgO10 · one magnesium ion, two threonate ions
Elemental magnesiumAbout 144 mg in every 3-capsule serve
VeganNo artificial fillers, colours or preservatives
In our capsule2,000 mg in every 3-capsule serve
Supplement facts
Serving size3 capsules
Servings per bottle30
Amount per serving
Magnesium L-Threonate2,000 mg
Other ingredients: rice flour, vegetable capsule
One active ingredient. No proprietary blend, so you know exactly how much you're getting.
Three capsules a day. That's the full 2,000 mg serve, and a bottle lasts 30 days.
Good to know. For adults. Check with your healthcare professional first if you're pregnant or breastfeeding, have a kidney condition or take medication.
How to take it
Three capsules a day, timed to your goal.
The serve is always three capsules with a meal. What changes is when you take them.
- Consistency matters more than timing. The trials measured results after 21 days to 12 weeks of daily use.
- Give it a full bottle before judging, and ideally three months.
- Pairs naturally with NMN, Korean panax ginseng or methylene blue.
Build your routine
Pairs well with.
Magnesium L-threonate makes a natural evening anchor. It pairs with NMN for cellular energy, and with ginseng or methylene blue for daytime focus.
NMN 500mg
Day and night: NMN tops up NAD+ for daytime energy, while magnesium L-threonate anchors your evening wind-down.
Korean Panax Ginseng 1600mg
A natural rhythm: ginseng for daytime vitality, magnesium L-threonate to switch off and rest at night.
Methylene Blue Capsules 10mg
Focus by day, rest by night: methylene blue for daytime clarity, magnesium L-threonate for the evening.
Spermidine 10mg
Two pillars of a longevity routine: spermidine supports cellular renewal while magnesium L-threonate supports restful sleep.
The Brain, Mood & Sleep Stack
Energy. Mood. Deep sleep.
- Korean GinsengDaytime energy
- Mg L-ThreonateCalm mind & sleep
- Saffron (affron®)Positive mood
Save with the stack
Brain, Mood & Sleep Stack
A day-and-night routine for the mind: ginseng for daytime energy and focus, affron® saffron for a positive mood, and magnesium L-threonate for a calm mind and deep sleep.
- Magnesium L-Threonate 2000mg$59.99
- Saffron Extract (affron®) 30mg$49.99
- Korean Panax Ginseng 1600mg$44.99
$129.99$154.97Save $24.98
View the stackMagnesium L-Threonate is already in the stack, so you won't need a separate bottle.
Magnesium L-Threonate 2,000 mg · 90 capsules
Start sleeping and thinking better today
Three capsules a day of the magnesium form made to reach the brain. Stock up and save up to 20%.
3 bottles · $1.70 a day
Free shipping over $100, fast Australian dispatch · Afterpay available
FAQ
Questions, answered.
Still deciding?Email us and a real person will reply. info@eternalelixir.com.au
What makes magnesium L-threonate (magnesium threonate) different from other magnesium?
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.
How much elemental magnesium is in each serve?
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.
When is the best time to take magnesium L-threonate?
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.
How long does it take to notice results?
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.
Can I take magnesium L-threonate with my other supplements?
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.
Is this product vegan?
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.
Who should not take magnesium L-threonate?
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.
How long does one bottle last?
At 3 capsules a day, as the label directs, a bottle lasts 30 days. Two bottles last two months, three last three and five last five. Take more than three a day and it runs out sooner.
Does Eternal Elixir ship to all of Australia?
We dispatch fast from within Australia, to every state and territory, so you can buy magnesium L-threonate in Australia without importing it. Delivery usually takes 3 to 5 business days to metro areas and 5 to 7 to regional areas. Orders over $100 ship free, and standard shipping is $10. Every order is covered by our 30-day money-back guarantee.
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Read all 18 reviewsRated 4.6 out of 5 by customers.
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