Most Magnesium Supplements Cannot Cross Blood-Brain Barrier to Affect Sleep

What was said

"Most forms of magnesium, magnesium oxide or magnesium citrate, Most of these forms of magnesium don't cross the blood-brain barrier, and sleep is produced by your brain. So how can something that doesn't get into your brain affect a brain process, number one?"

Walker challenged the popular trend of magnesium supplementation for sleep, revealing that the most common forms cannot cross the blood-brain barrier. He explained that original magnesium-sleep research only showed benefits in magnesium-deficient individuals returning to normal levels, not in people with already-normal magnesium who are creating what he called expensive urine. Only magnesium L-threonate shows some evidence of brain penetration.