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Claim
Strong Support
quantitative
Analysis v3

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...

75
Pro
0
Against

Mechanism

Synthesis from 1 study

How it works

Magnesium from the supplement gets into the brain and heart, where it calms the nerves that make the heart beat fast. This lets the heart slow down and vary its rhythm more during sleep, which shows the body is recovering better.

Most probable mechanism

In Simple Terms

Magnesium from the supplement enters the brain and heart, where it calms nerve signals that speed up the heart, allowing the heart to slow down and beat more steadily during sleep.

Causal chain
1

The L-threonate ligand in magnesium L-threonate binds to sodium-dependent glucose transporters at the blood-brain barrier, enabling efficient transport of magnesium ions into the brain parenchyma

Supported by evidence
which leads to
2

Magnesium ions accumulate in neurons of the hippocampus and prefrontal cortex, enhancing NMDA receptor function and synaptic plasticity in autonomic regulatory circuits

Supported by evidence
which leads to
3

Magnesium ions enter systemic circulation and reach cardiac autonomic ganglia and sinoatrial node tissue, where they block calcium influx and stabilize membrane potential

Supported by evidence
which leads to
4

Reduced calcium influx in pacemaker cells decreases firing rate, while enhanced vagal signaling increases parasympathetic modulation of heart rhythm

Supported by evidence
which leads to
5

Increased parasympathetic tone during sleep lowers resting heart rate and elevates heart rate variability, specifically the RMSSD metric

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

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
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Taking 1 gram of magnesium L-threonate daily for 21 days increases daytime activity and readiness scores in adults aged 35–55 who report sleep problems, as measured by the Oura ring.

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Taking 1 gram of magnesium L-threonate daily for 21 days increases deep sleep, REM sleep, and light sleep duration in adults aged 35–55 who report sleep problems, as measured by wearable biosensors.

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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
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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.

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