Magnesium L-Threonate
Magnesium bound to two molecules of L-threonic acid. Also sold as Magnesium Threonate, Magtein. No authority has published an intake figure for magnesium l-threonate itself. The figures further down are magnesium’s, and this page says what they count.
Stacky is an organisational tool, not a medical device. It does not provide medical advice, and nothing on this page says what magnesium L-Threonate does. Talk to a doctor or pharmacist before starting, stopping or changing what you take.
The number on the bottle and the number in the limit
Intake references for a mineral are set on the element. When EFSA writes 250 mg for magnesium, it means 250 milligrams of magnesium, the metal itself.
A supplement label can mean either of two things by a milligram. Some brands declare the magnesium delivered. Others declare the mass of the whole compound, magnesium plus whatever it is bound to. The magnesium is only a fraction of that weight, and the fraction is different for every salt.
| Form | Magnesium by weight |
|---|---|
| Magnesium oxide | about 60% |
| Magnesium malate | about 15% |
| Magnesium glycinate | about 14% |
| Magnesium citrate | about 11% to 16% |
| Magnesium L-threonate | about 8% |
Calculated from each compound’s anhydrous formula (Mg(C₄H₇O₅)₂ for magnesium l-threonate) using standard atomic weights. Real product is usually a little lower, because these salts are often sold hydrated. This is our arithmetic, not a regulator’s figure. The lowest fraction of any magnesium form sold. A 2,000 mg dose of the compound is roughly 145 mg of magnesium.
A label that declares the element writes it like this. The figure is magnesium, and it is the number the references below are about.
Magnesium (as magnesium L-threonate) .......... 144 mg
A label that names only the compound writes it like this. That figure is the whole salt, and the magnesium in it is about 8% of it.
Magnesium L-threonate .......................... 2,000 mg
Stacky does not convert between the two. We do not know which salt, which hydrate or which convention your brand used, and a guess would turn a figure you can check into one you cannot.
Published intake references for magnesium, the element
These figures are magnesium’s. They are here because magnesium l-threonate is a source of magnesium, not because any authority set them for magnesium l-threonate. Where the EU and the US disagree, both are shown; nothing is averaged, converted or reconciled. A tolerable upper intake level is the only kind of figure that sets a ceiling; a recommended or adequate intake is context, not a limit.
Applies to one chemical form only: readily dissociable magnesium salts (e.g. chloride, sulphate, aspartate, lactate) and compounds such as MgO EFSA →
Applies to one chemical form only: supplemental / pharmacological magnesium NIH ODS / IOM-DRI (NASEM) →
On the EU ceiling and this form. EFSA's upper limit names readily dissociable magnesium salts and compounds such as magnesium oxide. Magnesium L-threonate is not in that list. Whether the limit applies to it in the same way is a question for EFSA's document, not for this page.
Products in Stacky’s catalogue declaring magnesium l-threonate
1 product whose label names magnesium l-threonate as the form. Amounts are what the manufacturer prints, in whichever convention the manufacturer chose; the product page shows them as declared. No product here is recommended, ranked or endorsed.
Other forms of magnesium with a page
Indexed studies
A study reaches this page only if its own title names magnesium l-threonate or one of its recorded alternative names, and does not name a disease or clinical condition. Titles are the studies’ own words, newest first. A study appearing here is not a statement that magnesium l-threonate does what the study set out to look at. How this list is built →
| Title | Journal | Year | Reference |
|---|---|---|---|
| A Magtein(®), Magnesium L-Threonate, -Based Formula Improves Brain Cognitive Functions in Healthy Chinese Adults. | Nutrients | 2022 | PubMed 36558392 |
Showing 1 of the 5 papers indexed against magnesium l-threonate in Stacky.
About this page
What this page does not contain: a figure of its own for magnesium l-threonate, a recommended dose, a grade, a conversion of any product’s amount, or any statement that it treats, prevents or improves a condition. How these pages are built →
Figures are read from the authorities’ published tables and can go out of date when those tables are revised. If one here is wrong, tell us at support@stacky-app.com and we will check it against the source.