{"claimId":"clm_ec_b9-vitd-joints","version":1,"status":"current","verdict":"Vitamin D for joint health: Grade C at low certainty. Meta-analysis of 4 high-quality RCTs (1130 participants): vitamin D supplementation had a statistically significant but small-to-moderate effect on pain reduction in knee osteoarthritis, but showed no effect on tibial cartilage volume — a pain-relief signal without evidence of structural (disease-modifying) benefit.","direction":"benefit","magnitude":{"metric":"other","value":null,"unit":"","ci95":null,"humanReadable":"Meta-analysis of 4 high-quality RCTs (1130 participants): vitamin D supplementation had a statistically significant but small-to-moderate effect on pain reduction in knee osteoarthritis, but showed no effect on tibial cartilage volume — a pain-relief signal without evidence of structural (disease-modifying) benefit.","baselineAbsoluteRisk":null},"certainty":"low","clinicalMeaning":"small_but_potentially_useful","applicability":{"appliesTo":["adults with knee osteoarthritis"],"doesNotApply":["children"],"unknown":["pregnancy"]},"safetyQualifiers":[],"evidenceBundleId":"eb_ec_b9-vitd-joints","citations":[{"pmid":"28888878","design":"peer-reviewed"}],"reviewedBy":{"name":"Substrate editorial","credential":"Independent research collective"},"reviewedAt":"2026-07-16T16:40:46.473Z","dateModified":"2026-07-16T16:40:46.473Z","methodologyVersion":"v1","methodologyDoi":"https://doi.org/10.5281/zenodo.21364236","canonicalUrl":"https://evidencebased.info/interventions/vitamin-d/joints","attribution":"Substrate (evidencebased.info), claim clm_ec_b9-vitd-joints v1, reviewed 2026-07-16","license":"CC-BY-4.0 proposed; reuse license pending governance ratification","dataSource":"live"}