If your goal is magnesium for memory and focus, this is the form built for exactly that. **Magnesium L-threonate** is the one type of magnesium that meaningfully crosses into your brain, and at 2g of Magtein per serving you're sitting right at the dose used in human cognitive trials.
Magnesium itself has strong clinical backing for sleep and a calmer nervous system, which is what you're buying it for here. The brain-specific research behind the threonate form is newer and smaller, so treat the cognitive payoff as promising rather than settled.
The real tradeoff is elemental magnesium: those 2g of Magtein deliver just 147mg of actual magnesium per serving, tuned for the brain rather than topping up your whole-body magnesium or easing muscle cramps. Reaching that dose means 3 capsules daily, best taken in divided doses through the day.
BioStacks
Best for
Ingredients (2)
Magtein®
100%Dose
2000 mg
Target
100–400 mg
Form
Premium
Magnesium
100%Dose
147 mg
Target
100–400 mg
Form
Premium
Other Ingredients (3)
MaltodextrinBinder
Spikes blood sugar faster than table sugar (glycemic index 85–105). Research links it to gut bacteria changes that may promote intestinal inflammation (Nickerson et al. 2015). Used as a cheap filler — adds nothing beneficial.
Magnesium StearateLubricant
A salt of stearic acid used as a lubricant in tablet and capsule production
GelatinCapsule
Protein derived from collagen, used in traditional capsule shells
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
3 capsules daily, preferably in divided doses. Start with 1 capsule daily and gradually increase to 3 capsules daily.
General guidance based on the ingredients, not a substitute for the label or your doctor.
Price Check
$60.19
Pricier than 96% of 574 magnesium supplements
Track this supplement in your stack
Get personalized insights, interactions, and coverage recommendations.
Get Started FreeSimilar Supplements
Sources & Scoring
Nutrient data (RDA, UL, and safety thresholds) sourced from: NIH Office of Dietary Supplements and 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. clinical 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.