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.