The Claim

In healthy adults with poor sleep, supplementation with 250 mg elemental magnesium as magnesium bisglycinate daily for 4 weeks results in 19% achieving a clinically significant improvement in insomnia severity (defined as a reduction of ≥6 points on the Insomnia Severity Index) compared to 11% in the placebo group, suggesting that a subset of individuals may benefit.

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 250 mg of magnesium daily for a month helps some people sleep better. In a study, about 19 out of 100 people who took magnesium showed a big improvement in their sleep problems, while only 11 out of 100 people taking a sugar pill (placebo) improved that much. So a small number of people can get real benefit from this supplement.

See the scientific wording

Approximately 19% of healthy adults with poor sleep taking 250 mg elemental magnesium as magnesium bisglycinate daily for 4 weeks achieve a clinically significant improvement in insomnia severity (defined as a reduction of ≥6 points on the Insomnia Severity Index), compared to 11% in the placebo group, indicating that a subset of individuals may experience meaningful benefit.

Why this might work

The supplement contains magnesium and glycine. Magnesium calms the brain by boosting natural inhibitory signals that reduce nerve activity. Glycine also acts as a calming neurotransmitter and helps lower the body's temperature, which is a signal that it's time to sleep. Together, these effects relax the muscles and calm the mind, making it easier to fall asleep and sleep more deeply.

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 showed that about 1 in 5 people taking magnesium got a big improvement in sleep, compared to about 1 in 10 taking a fake pill, so the claim accurately describes what happened.

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.