**Magnesium L-threonate** is one of the few magnesium forms shown to cross the blood-brain barrier, which is why it's specifically studied for cognitive and neurological benefits rather than general magnesium repletion. Each three-capsule serving delivers 144mg of elemental magnesium from 1,860mg of the full threonate compound. If your primary goal is brain health or sleep support, this form targets those pathways more directly than common alternatives like citrate or oxide.

Your 144mg per serving falls within the clinical supplemental range of 100-400mg, though it sits on the lower end. That said, threonate is on the UL-safe list, meaning your body tolerates it well at higher intakes without the GI discomfort that can come with other forms. The dosing split — one capsule in the morning, two before bed — aligns with how threonate is typically used in research settings.

The capsule shell is HPMC (plant-based), and there are no additional inactive ingredients beyond that. You're getting a single-ingredient product with nothing else added to the formula. If you're already meeting your baseline magnesium needs through diet or another supplement, this product is designed to layer on the brain-specific benefits that threonate provides.