The Claim

In healthy adults with self-reported poor sleep, daily supplementation with 250 mg elemental magnesium (as magnesium bisglycinate) for 4 weeks does not significantly affect secondary sleep-related outcomes—including sleep quality (Sleep Quality Scale), daytime sleepiness (Epworth Sleepiness Scale), fatigue (Fatigue Severity Scale), mood (PANAS), perceived stress (PSS), and symptoms of depression and anxiety (PHQ-4)—compared to placebo.

Source: Magnesium Bisglycinate Supplementation in Healthy Adults Reporting Poor Sleep: A Randomized, Placebo-Controlled Trial

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
90score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Cause and effect
1 study reviewed
In plain English

Taking a magnesium supplement every day for 4 weeks doesn't make a real difference in sleep quality, daytime sleepiness, tiredness, mood, stress, or symptoms of depression and anxiety in healthy adults who have trouble sleeping. When compared to a pill with no active medicine, the results are about the same.

See the scientific wording

Magnesium bisglycinate supplementation (250 mg elemental magnesium daily for 4 weeks) does not significantly affect secondary sleep-related outcomes including sleep quality (Sleep Quality Scale), daytime sleepiness (Epworth Sleepiness Scale), fatigue (Fatigue Severity Scale), mood (PANAS), perceived stress (PSS), or symptoms of depression and anxiety (PHQ-4) compared to placebo in healthy adults with self-reported poor sleep.

Why this might work

Taking magnesium can help your muscles relax and calm your brain a little. But these changes are too small to affect the chemicals that control your mood, stress, and tiredness during the day. So you don't feel different in those ways.

Suggested mechanismbased on 1 study

What the research says

1 study

  1. Study: Magnesium Bisglycinate Supplementation in Healthy Adults Reporting Poor Sleep: A Randomized, Placebo-Controlled Trial

    The study gave people magnesium or a fake pill for a month and found that magnesium didn't change things like tiredness during the day, mood, or stress compared to the fake pill. So the claim is correct.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

Fit Body Science verdict — we translate health claims into clear verdicts backed by peer-reviewed research.

Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.