Supplements
magnesium decreases skeletal muscle cramps
In plain terms: Does magnesium stop muscle cramps?
Part of: 🧪 magnesium
Probably not—the best evidence (a Cochrane review) finds little to no benefit for the common night-time/idiopathic leg cramps.
Evidence ladder
How far up the ladder this claim has climbed. A high consensus on a low rung means "consistent so far," not "proven in people."
Top evidence so far: All trials, pooled (Meta-analysis)
How the studies fall
What the evidence shows
Despite heavy marketing, the best evidence is **unsupportive** for idiopathic/nocturnal cramps in general/older adults: the Cochrane review found magnesium unlikely to provide clinically meaningful benefit. Some individual RCTs of specific formulations (e.g. magnesium oxide monohydrate) report benefit, keeping it from outright refuted, but the consensus leans against. measured_by:: [[skeletal musc
The evidence (3)
| Source | Grade | Stance | Quality | Finding |
|---|---|---|---|---|
| Roffe et al. 2002 · Med Sci Monit | RCT | contradicts | moderate | Double-blind crossover RCT (chronic persistent leg cramps, non-pregnant): Mg citrate NOT significantly better than placebo. |
| Barna et al. 2021 · Nutr J | RCT | supports | moderate | Multicenter double-blind RCT of magnesium oxide monohydrate (enhanced cellular absorption) for nocturnal leg cramps: reduced cramp burden vs placebo. |
| Garrison et al. 2020 · Cochrane Database Syst Rev | meta-analysis | contradicts | high | Cochrane review (update): magnesium unlikely to provide clinically meaningful reduction in idiopathic/older-adult muscle cramps; efficacy for cramps remains unproven. |
Disagree, or know a study we missed?
We grade by evidence, not opinions. The way to weigh in is to point us to a study we haven't cited (check the evidence table above first), or to flag a problem with one we have. Every submission is reviewed; if it holds up, the grade updates and shows in Science Changes Its Mind.
Opens a short form. You'll sign in with Google so submissions are tied to a real account — we don't display your identity, and we only accept a link we can verify (PubMed, DOI, ClinicalTrials.gov).
Educational only, not medical advice. Grades and scores reflect published evidence weighted by study design and quality; see the methodology.