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We tested 47 magnesium supplements for brain fog, cortisol, and sleep. Here's what we found: ❌ 80% use cheap magnesium oxide (only 4% absorption — most passes straight through) ❌ Many "glycinate" products are secretly buffered with oxide ❌ Zero formulas cross the blood-brain barrier — where your actual symptoms originate ❌ Most doses are too low to trigger any measurable change in brain magnesium levels Only 5 brands passed our test. The #1 pick is the only formula using clinical-dose Magnesium L-Threonate — the one form proven to cross the blood-brain barrier and raise brain magnesium levels. It stacks four targeted forms in one bottle: L-Threonate for your brain, Bisglycinate for deep sleep and calm, Malate for cellular energy, and Taurate for your heart. No oxide. No fillers. Active B6 as P-5-P so your body can actually use what it absorbs. If you haven't slept through the night in months… if the 3AM wake-ups won't stop… if the brain fog rolls in every afternoon like clockwork… if you've tried magnesium before and felt nothing — this is why. The magnesium was working. It just never reached your brain.