{"claimId":"clm_ec_b8-vitd-sleep","version":1,"status":"current","verdict":"Vitamin D for sleep: Grade C at low certainty. Systematic review and meta-analysis (moderate certainty): vitamin D supplementation showed promise for improving sleep quality, but its effect on sleep quantity, sleep disorders, sleepiness, and restless legs syndrome was inconsistent across studies. Promising but not settled.","direction":"benefit","magnitude":{"metric":"other","value":null,"unit":"","ci95":null,"humanReadable":"Systematic review and meta-analysis (moderate certainty): vitamin D supplementation showed promise for improving sleep quality, but its effect on sleep quantity, sleep disorders, sleepiness, and restless legs syndrome was inconsistent across studies. Promising but not settled.","baselineAbsoluteRisk":null},"certainty":"low","clinicalMeaning":"small_but_potentially_useful","applicability":{"appliesTo":["adults"],"doesNotApply":["children"],"unknown":["pregnancy"]},"safetyQualifiers":[],"evidenceBundleId":"eb_ec_b8-vitd-sleep","citations":[{"pmid":"35268051","design":"peer-reviewed"}],"reviewedBy":{"name":"Substrate editorial","credential":"Independent research collective"},"reviewedAt":"2026-07-16T16:40:39.059Z","dateModified":"2026-07-16T16:40:39.059Z","methodologyVersion":"v1","methodologyDoi":"https://doi.org/10.5281/zenodo.21364236","canonicalUrl":"https://evidencebased.info/interventions/vitamin-d/sleep","attribution":"Substrate (evidencebased.info), claim clm_ec_b8-vitd-sleep v1, reviewed 2026-07-16","license":"CC-BY-4.0 proposed; reuse license pending governance ratification","dataSource":"live"}