Compare
Magnesium Oxide vs Magnesium L-Threonate
Compare Magnesium Oxide and Magnesium L-Threonate: timing, food, doses, forms and existing interaction guidance.
| Magnesium Oxide | Magnesium L-Threonate | |
|---|---|---|
| Category | Minerals | Minerals |
| Best time | Dinner | Bedtime |
| Food | With food | With or without food |
| Common dose | 200–350 mg | 100–150 mg |
| Upper limit | 350 mg/day UL applies to all supplemental magnesium combined (not food); mainly to prevent diarrhea. | 350 mg/day UL applies to all supplemental magnesium combined (not food); mainly to prevent diarrhea. |
| Solubility | Water-soluble | Water-soluble |
| Description | Packs the most magnesium into one pill but is poorly absorbed — about 4% in one study, against much higher, similar absorption for chloride, lactate and aspartate. Mainly useful as a laxative or antacid rather than to raise magnesium levels. | Form designed to raise magnesium in the brain, which it did in rats. In an industry-sponsored randomized trial in adults with sleep complaints, it improved sleep-quality scores. It supplies little elemental magnesium per gram, so it's a poor way to correct a deficiency. |
| Timing note | Take with food; it works partly as an antacid and laxative. | Commonly taken in the evening, sometimes split morning and evening. |
| Forms to look for |
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| References |
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Common product or study range — not a personal recommendation. Upper limits are ceilings, not targets.
If you take both
Usually unnecessary — both supply magnesium, and the amounts add up.
Pick one form, or add up the elemental magnesium on both labels.
Common questions
What is the difference between Magnesium Oxide and Magnesium L-Threonate?
Magnesium Oxide: Packs the most magnesium into one pill but is poorly absorbed — about 4% in one study, against much higher, similar absorption for chloride, lactate and aspartate. Mainly useful as a laxative or antacid rather than to raise magnesium levels. Magnesium L-Threonate: Form designed to raise magnesium in the brain, which it did in rats. In an industry-sponsored randomized trial in adults with sleep complaints, it improved sleep-quality scores. It supplies little elemental magnesium per gram, so it's a poor way to correct a deficiency.
Can I take Magnesium Oxide and Magnesium L-Threonate together?
Usually unnecessary — both supply magnesium, and the amounts add up.