Nogues, XavierOvejero, DianaPineda-Moncusí, MartaBouillon, RogerArenas, DolorsPascual, JulioRibes, AnnaGuerri-Fernandez, RobertVillar-Garcia, JuditRial, AboraGimenez-Argente, CarmeCos, Maria LourdesRodriguez-Morera, JaimeCampodarve, IsabelQuesada-Gomez, José ManuelGarcia-Giralt, Natalia2025-01-072025-01-072021https://hdl.handle.net/10668/25598COVID-19 is a major health problem because of saturation of intensive care units (ICU) and mortality. Vitamin D has emerged as a potential treatment able to reduce the disease severity. This work aims to elucidate the effect of 25(OH)D3 (calcifediol) treatment on COVID-19-related outcomes. This observational cohort study was conducted from March to May 2020, among patients admitted to COVID-19 wards of Hospital del Mar, Barcelona, Spain. A total of 930 patients with COVID-19 were included; 92 were excluded because of previous calcifediol intake. Of the remaining 838, a total of 447 received calcifediol (532 μg on day 1 plus 266 μg on days 3, 7, 15, and 30), whereas 391 were not treated at the time of hospital admission (intention-to-treat). Of the latter, 53 patients were treated later during ICU admission and were allocated in the treated group in a second analysis. In healthy individuals, calcifediol is about 3.2-fold more potent on a weight basis than cholecalciferol. Main outcome measures were ICU admission and mortality. ICU assistance was required by 102 (12.2%) participants. Out of 447 patients treated with calcifediol at admission, 20 (4.5%) required the ICU, compared to 82 (21%) out of 391 nontreated (P  In patients hospitalized with COVID-19, calcifediol treatment significantly reduced ICU admission and mortality.enCOVID-19ICU admissioncalcifediolmortalityvitamin DAdultAgedCOVID-19CalcifediolCholecalciferolCohort StudiesComorbidityFemaleHospital MortalityHospitalizationHumansIntensive Care UnitsMaleMiddle AgedSARS-CoV-2SpainTreatment OutcomeVitamin DVitamin D DeficiencyCOVID-19 Drug Treatmentresearch article34097036open access10.1210/clinem/dgab4051945-7197PMC8344647https://academic.oup.com/jcem/article-pdf/106/10/e4017/41098012/dgab405.pdfhttps://pmc.ncbi.nlm.nih.gov/articles/PMC8344647/pdf