{"claimId":"clm_ec_b9-vitd-blood-sugar","version":1,"status":"current","verdict":"Vitamin D for blood sugar: Grade — at moderate certainty. Large randomized trial (D2d ancillary analysis) in older US adults: vitamin D supplementation did NOT significantly reduce incidence of type 2 diabetes in this trial alone. When pooled with prior trials in meta-analysis, a modest reduction was observed — so the evidence is suggestive at the pooled level but the single largest trial itself was a null result.","direction":"null","magnitude":{"metric":"other","value":null,"unit":"","ci95":null,"humanReadable":"Large randomized trial (D2d ancillary analysis) in older US adults: vitamin D supplementation did NOT significantly reduce incidence of type 2 diabetes in this trial alone. When pooled with prior trials in meta-analysis, a modest reduction was observed — so the evidence is suggestive at the pooled level but the single largest trial itself was a null result.","baselineAbsoluteRisk":null},"certainty":"moderate","clinicalMeaning":"no_established_threshold","applicability":{"appliesTo":["older adults at risk for type 2 diabetes"],"doesNotApply":["children"],"unknown":["pregnancy"]},"safetyQualifiers":[],"evidenceBundleId":"eb_ec_b9-vitd-blood-sugar","citations":[{"pmid":"40199888","design":"peer-reviewed"}],"reviewedBy":{"name":"Substrate editorial","credential":"Independent research collective"},"reviewedAt":"2026-07-16T16:40:48.471Z","dateModified":"2026-07-16T16:40:48.471Z","methodologyVersion":"v1","methodologyDoi":"https://doi.org/10.5281/zenodo.21364236","canonicalUrl":"https://evidencebased.info/interventions/vitamin-d/blood-sugar","attribution":"Substrate (evidencebased.info), claim clm_ec_b9-vitd-blood-sugar v1, reviewed 2026-07-16","license":"CC-BY-4.0 — attribution with link required"}