Built for brain and cognitive support, this is magnesium in the one form — **magnesium L-threonate** (Magtein) — shown to raise magnesium levels inside the brain. The label's headline 2,000mg per 3-capsule serving is the full compound; that works out to 144mg of elemental magnesium, sitting comfortably within the 100–400mg supplemental range.
What you're buying is the form, not the milligram count. L-threonate is the only magnesium with research suggesting it meaningfully crosses into the brain, which is why it targets memory and focus rather than sleep or muscle cramps. The honest caveat: human cognitive evidence is limited to a few small trials, so treat the brain benefit as promising rather than proven.
If cognition is your goal, this is the form to reach for. If you just want to top up an everyday magnesium shortfall, 144mg per serving is a partial contribution toward daily needs, not a full day's worth.
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Ingredients (2)
Magtein magnesium L-threonate
100%Dose
2000 mg
Target
100–400 mg
Form
Premium
Magnesium
100%Dose
144 mg
Target
100–400 mg
Form
Not listed
Other Ingredients (5)
Silicon DioxideAnti-caking
Fine silica powder used to prevent clumping
Vegetable StearateLubricant
A plant-derived salt of stearic acid (typically magnesium or calcium) used as a tablet lubricant
Microcrystalline CelluloseBinder
Plant-derived cellulose used as a binder and filler in supplements
Stearic AcidLubricant
Saturated fatty acid used as tablet lubricant
Microcrystalline CelluloseBinder
Plant-derived cellulose used as a binder and filler in supplements
How to Take It
Best taken in the evening
Magnesium L-threonate is designed to raise magnesium in the brain — shown in animals. The human cognition trial dosed 1.5–2 g/day, usually split with a dose in the evening.
With or without food
Space it a couple of hours from Iron and Calcium
On the label
TAKE 3 DAILY: This suggested dosage can be taken with or without food.
General guidance based on the ingredients, not a substitute for the label or your doctor.
Price Check
$49.97
Pricier than 95% of 579 magnesium supplements
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Sources & Scoring
Nutrient data (RDA, UL, and safety thresholds) sourced from the NIH Office of Dietary Supplements and the National Academies Dietary Reference Intakes (DRI).
This is not medical advice. Consult a healthcare provider before making changes to your supplement routine.
The score analyzes what's on the label: ingredient doses vs. studied ranges, chemical forms, evidence levels, and known interactions. It does not verify label accuracy or test for contaminants — for that, look for third-party certifications like USP or NSF.