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Claim
Strong Support
correlational
Analysis v3

In adults aged 18–45 with self-reported poor sleep, taking 2 grams of magnesium L-threonate daily for six weeks is associated with a 7.5-year reduction in estimated cognitive age compared to placebo,...

75
Pro
0
Against

Mechanism

Synthesis from 1 study

How it works

The supplement delivers magnesium into the brain, strengthening connections between brain cells that handle memory and thinking. It also calms the nervous system during sleep, slowing the heart and improving recovery. Together, these changes make the brain work like it did when the person was...

Most probable mechanism

In Simple Terms

Magnesium from the supplement enters the brain through special transporters, raising magnesium levels inside brain cells. This boosts communication between brain cells, especially in areas that control memory and thinking. At the same time, magnesium slows the heart rate and improves heart rhythm during sleep, which helps the brain recover and reset. Together, these changes make the brain function like that of a younger person.

Causal chain
1

Magnesium L-threonate crosses the blood-brain barrier via sodium-dependent glucose transporters, increasing intracellular magnesium concentration in neurons

Verified by multiple studies
which leads to
2

Elevated neuronal magnesium enhances NMDA receptor function and increases synaptic density in hippocampal and prefrontal circuits

Verified by multiple studies
which leads to
3

Increased synaptic plasticity in memory and executive function networks improves working memory and episodic memory performance

Verified by multiple studies
which leads to
4

Magnesium enters cardiac and autonomic nervous system tissues, acting as a calcium antagonist to reduce sympathetic drive and enhance parasympathetic (vagal) tone

Verified by multiple studies
which leads to
5

Increased vagal tone during sleep lowers resting heart rate and elevates heart rate variability, promoting neural recovery and metabolic clearance

Verified by multiple studies
which leads to
6

Combined enhancement of synaptic plasticity and sleep-dependent neural restoration reduces the biological age of cognitive function

Verified by multiple studies

Evidence from Studies

Supporting (1)

75

Community contributions welcome

75

The effects of magnesium L-threonate (Magtein®) on cognitive performance and sleep quality in adults: a randomised, double-blind, placebo-controlled trial

Randomized Controlled Trial
Human
2025

Contradicting (0)

0

Community contributions welcome

No contradicting evidence found

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

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Source Study

The effects of magnesium L-threonate (Magtein®) on cognitive performance and sleep quality in adults: a randomised, double-blind, placebo-controlled trial

Score: 75
DOI: 10.3389/fnut.2025.1729164

Similar Assertions

In healthy adults aged 18–45 with self-reported poor sleep, taking 2 grams of magnesium L-threonate daily for 6 weeks leads to an 8.4-point increase in overall cognitive performance on the NIH Total Cognition Composite, compared to a 5.6-point increase in those taking a placebo.

75
0
94%

Adults aged 35–55 with self-reported sleep problems who take 1 gram of magnesium L-threonate daily for 21 days experience higher daytime energy, greater mental alertness, and increased productivity, as recorded by self-reports and wearable devices.

61
0
83%

In adults aged 18–45 with poor sleep, taking 2 grams of magnesium L-threonate daily for 6 weeks leads to a greater reduction in self-reported sleep problems than a placebo, but does not change sleep measurements from wearable devices.

75
0
81%

Adults aged 18–45 with poor sleep who took 2 grams of magnesium L-threonate daily for 6 weeks showed a 6.3% improvement in reaction time and visuo-motor coordination on the 3D Aim Trainer, while those taking a placebo showed no significant change.

75
0
81%

In adults aged 18–45 with self-reported poor sleep, taking 2 grams of magnesium L-threonate daily for six weeks lowers resting heart rate during sleep by 1.32 beats per minute and raises heart rate variability by 1.45 milliseconds.

75
0
78%