Overview High Dose Cholecalciferol to Reduce the Incidence of Gestational Diabetes in High Risk Pregnant Women Status: Withdrawn Trial end date: 2020-06-01 Target enrollment: Participant gender: Summary Demonstrate dose-dependent relationship between vitamin D supplementation and rates of gestational diabetes. Phase: Phase 1/Phase 2 Details Lead Sponsor: University of MinnesotaTreatments: CholecalciferolVitamin D