This is a magnesium supplement specifically designed for your brain. **Magnesium L-Threonate** (branded as Magtein) is the only form shown in research to effectively raise magnesium levels in the brain, making it relevant for cognitive function, memory, and sleep quality. You're getting 2,000 mg of the compound per full 3-capsule serving, yielding 144 mg of elemental magnesium.
That 144 mg of elemental magnesium sits within the 100–400 mg clinical range, though toward the lower end. The real value here isn't the raw magnesium quantity — it's the L-threonate delivery mechanism. If your goal is general magnesium repletion (muscle cramps, energy, relaxation), other forms give you more magnesium per capsule. If your goal is brain-specific support, the form justifies the lower elemental yield.
The tradeoff is pill burden: you need all three capsules daily to hit the studied dose. The label recommends splitting them — one in the morning, two before bed — which adds some friction to your routine.
BioStacks
Other Ingredients (4)
Rice FlourFiller
Rice-based ingredients carry risk of inorganic arsenic contamination (FDA and Consumer Reports). Rice accumulates arsenic from soil at higher rates than other grains. Used as a cheap filler — adds nothing beneficial.
Silicon DioxideAnti-caking
Fine silica powder used to prevent clumping
HypromelloseCapsule
Plant-derived capsule material from cellulose
Stearic AcidLubricant
Saturated fatty acid used as tablet lubricant
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
Suggested Usage: Take 3 capsules daily. Best when taken in divided doses (take 1 capsule in the morning and 2 capsules two hours before sleep).
General guidance based on the ingredients, not a substitute for the label or your doctor.
Price Check
$36.74
Pricier than 86% 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.