

Dr. Sophia Bennett - Neurologist & Sleep Expert
Active· since Mar 30, 2026
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If you've tried magnesium for sleep and felt nothing — this is exactly why. Standard magnesium tablets are processed through your digestive system. By the time they've cleared your gut, up to 80% of the dose is gone. You can take a 400mg pill and arrive at your brain with 16mg of it. 16mg is not a therapeutic dose. 16mg is why nothing happened. This isn't a problem with magnesium. It's a problem with delivery. After 40, your digestive absorption of magnesium drops further — which means the form and delivery method matter more than the dose on the label. Most people who "tried magnesium and it didn't work" didn't actually try magnesium at full dose. They tried whatever survived their gut. There's a reason nitroglycerin for cardiac events is given sublingually — under the tongue. It bypasses digestion entirely. Full dose. Straight to bloodstream. In under 30 seconds. Nobody was applying this to sleep magnesium. Until recently.
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