{"claimId":"clm_ec_b3-mg-migraine","version":1,"status":"current","verdict":"Magnesium for migraine frequency: Grade C at low certainty. 10 oral-magnesium RCTs (n=789): reduced migraine frequency and intensity vs. placebo (odds ratios 0.20 and 0.27, no CIs given); some trials had inadequate randomization per the review authors. A separate IV arm covered acute attacks, not prevention.","direction":"benefit","magnitude":{"metric":"other","value":null,"unit":"","ci95":null,"humanReadable":"10 oral-magnesium RCTs (n=789): reduced migraine frequency and intensity vs. placebo (odds ratios 0.20 and 0.27, no CIs given); some trials had inadequate randomization per the review authors. A separate IV arm covered acute attacks, not prevention.","baselineAbsoluteRisk":null},"certainty":"low","clinicalMeaning":"small_but_potentially_useful","applicability":{"appliesTo":["adults with migraine, oral prophylaxis"],"doesNotApply":["children"],"unknown":["pregnancy"]},"safetyQualifiers":["minor_with_ssri"],"evidenceBundleId":"eb_ec_b3-mg-migraine","citations":[{"pmid":"26752497","design":"peer-reviewed"}],"reviewedBy":{"name":"Substrate editorial","credential":"Independent research collective"},"reviewedAt":"2026-07-16T07:10:09.457Z","dateModified":"2026-07-16T07:10:09.457Z","methodologyVersion":"v1","methodologyDoi":"https://doi.org/10.5281/zenodo.21364236","canonicalUrl":"https://evidencebased.info/interventions/magnesium/migraine","attribution":"Substrate (evidencebased.info), claim clm_ec_b3-mg-migraine v1, reviewed 2026-07-16","license":"CC-BY-4.0 — attribution with link required"}