For decades, magnesium sat in the supplement aisle as a mineral for muscle cramps, sleep, and general nutrition. Around 2010, that changed. A branded form called magnesium L-threonate launched on the back of a 2010 MIT rodent paper, and a new category was born — magnesium for the brain. Fifteen years later, that category has expanded to include other brand-targeted forms, premium price points, and confident claims about cognition, memory, and synaptic density. In this investigation, we review the science underneath those claims.

IN THIS INVESTIGATION

• What two papers from 1984 actually said about magnesium and the brain
• Why magnesium concentrates differently in brain fluid than in blood, and what that implies for supplementation
• The 2010 MIT paper that launched the brand-targeted magnesium category, and the question it didn't answer
• What you find when you trace the authorship of the rodent studies that "independently confirmed" the original
• The magnesium acetyl taurate line and what a 2026 head-to-head comparison reveals about form-specific brain delivery
• Every human trial on magnesium L-threonate, who funded each one, and the structural feature they all share
• The 2024 paper that directly measured magnesium inside living human brains for the first time in twenty-five years
• What the ordinary forms — citrate, chloride, oxide — have actually demonstrated in independent human trials
• Why a failed 2007 traumatic brain injury trial matters for everything that followed
• The single piece of evidence the brand-targeted magnesium story has never produced
• What to do if you take magnesium for cognitive reasons

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