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Magnesium L-Threonate

Also known as Magtein, Magnesium threonate

What it is: Magnesium bound to L-threonic acid
What it does: Delivers magnesium with proposed advantages for brain penetration and synaptic function
Status: Widely used supplement
Evidence: Low to Moderate. Emerging human data.
Uses: Cognitive support; sleep; brain health protocols

Caution. More expensive than other forms; GI tolerance varies by individual.

Summary

Magnesium L-threonate is a magnesium salt complexed with L-threonic acid, studied for its potential to raise brain magnesium and support synaptic function. It is used in cognitive and sleep protocols, though human data are more limited than for other magnesium forms. Cost per element is higher, and tolerability varies similarly to other magnesium salts.

Checked Jul 19, 2026.

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This entry summarises published information in plain language. It is not medical advice, a dosing recommendation or a substitute for a qualified healthcare professional. Many peptides are not approved for human use, and legal status varies by country. Check anything you rely on against primary sources.