Magnesium Threonate
Magnesium L-threonate is a chemically manufactured salt of magnesium and threonic acid, a breakdown product of vitamin C, used as a magnesium source in supplements.
What it is studied for
The strongest rated effects first. Bars show the size of the effect, the letter grades the evidence, and each rating lists the studies behind it.
What is magnesium L-threonate?
It is a chemically manufactured magnesium source used in supplements. EFSA concluded that its magnesium is absorbable; that assessment did not establish benefits for sleep or cognition. 1
Why people take it
SuppCo community snapshot, 2026-09-28. Reasons for use are not evidence that it works.
Questions people ask
Did the sleep study show an insomnia treatment?
No established treatment claim follows from it: overall insomnia severity did not separate significantly from placebo over 21 days. 2
Does a better cognitive score mean a younger brain?
The 2026 study’s brain-age estimate was derived from test performance. It does not demonstrate reversal of biological brain aging. 3
Can I add it to another magnesium product?
The magnesium supplied by each product contributes to supplemental intake. The US adult upper limit is 350 mg daily from supplements and medicines, excluding food; EFSA’s assessment uses a 250 mg limit for supplemental readily dissociable magnesium salts. 1 4
Related nutrients
Magnesium Citrate
Magnesium Taurate
Magnesium MalateSources
- Magnesium: Fact Sheet for Health Professionals NIH Office of Dietary Supplements
