Overview Vitamin D for the Treatment of Severe Asthma Status: Unknown status Trial end date: 2010-08-01 Target enrollment: Participant gender: Summary The investigators want to test the hypothesis, that vitamin D3 improves pulmonary function and quality of life in patients with asthma relatively resistant to glucocorticoids. Phase: Phase 4 Details Lead Sponsor: Kantonsspital Baselland BruderholzCollaborator: University Hospital, Basel, SwitzerlandTreatments: CalcitriolErgocalciferolsVitamin DVitamins