# The VITDALIZE Study: Effect of High-dose Vitamin D3 on 28-day Mortality in Adult Critically Ill Patients

> **NCT03188796** · PHASE3 · RECRUITING · sponsor: **Medical University of Graz** · enrollment: 2400 (estimated)

## Conditions studied

- Critical Illness
- Vitamin D Deficiency
- Covid19

## Interventions

- **DRUG:** Cholecalciferol
- **DRUG:** Placebo

## Key facts

- **NCT ID:** NCT03188796
- **Lead sponsor:** Medical University of Graz
- **Sponsor class:** OTHER
- **Phase:** PHASE3
- **Study type:** INTERVENTIONAL
- **Status:** RECRUITING
- **Start date:** 2017-10-10
- **Primary completion:** 2027-03
- **Final completion:** 2027-03
- **Target enrollment:** 2400 (ESTIMATED)
- **Last updated:** 2025-11-21

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## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT03188796

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT03188796, "The VITDALIZE Study: Effect of High-dose Vitamin D3 on 28-day Mortality in Adult Critically Ill Patients". Retrieved via AI Analytics 2026-05-24 from https://api.ai-analytics.org/clinical/NCT03188796. Licensed CC0.

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