# DO IT Trial: Vitamin D Outcomes and Interventions In Toddlers

> **NCT01419262** · PHASE3 · COMPLETED · sponsor: **The Hospital for Sick Children** · enrollment: 703 (actual)

## Conditions studied

- Respiratory Tract Infections
- Asthma
- Avitaminosis

## Interventions

- **DRUG:** Vitamin D - Cholecalciferol 400 IU
- **DRUG:** Vitamin D3 - Cholecalciferol 2000 IU

## Key facts

- **NCT ID:** NCT01419262
- **Lead sponsor:** The Hospital for Sick Children
- **Sponsor class:** OTHER
- **Phase:** PHASE3
- **Study type:** INTERVENTIONAL
- **Status:** COMPLETED
- **Start date:** 2011-09
- **Primary completion:** 2015-05
- **Final completion:** 2015-10
- **Target enrollment:** 703 (ACTUAL)
- **Last updated:** 2019-06-14

## Collaborators

- [object Object]
- [object Object]

## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT01419262

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT01419262, "DO IT Trial: Vitamin D Outcomes and Interventions In Toddlers". Retrieved via AI Analytics 2026-05-24 from https://api.ai-analytics.org/clinical/NCT01419262. Licensed CC0.

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