# Optimization of Blood Levels of 25(OH)-Vitamin D in African Americans

> **NCT04939792** · EARLY_PHASE1 · COMPLETED · sponsor: **Louisiana State University Health Sciences Center Shreveport** · enrollment: 165 (actual)

## Conditions studied

- Vitamin D Deficiency

## Interventions

- **DRUG:** Vitamin D
- **DRUG:** Placebo
- **DRUG:** Vitamin D + L-cysteine
- **DRUG:** L-cysteine

## Key facts

- **NCT ID:** NCT04939792
- **Lead sponsor:** Louisiana State University Health Sciences Center Shreveport
- **Sponsor class:** OTHER
- **Phase:** EARLY_PHASE1
- **Study type:** INTERVENTIONAL
- **Status:** COMPLETED
- **Start date:** 2020-11-06
- **Primary completion:** 2022-10-31
- **Final completion:** 2022-10-31
- **Target enrollment:** 165 (ACTUAL)
- **Last updated:** 2023-06-08


## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT04939792

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT04939792, "Optimization of Blood Levels of 25(OH)-Vitamin D in African Americans". Retrieved via AI Analytics 2026-06-02 from https://api.ai-analytics.org/clinical/NCT04939792. Licensed CC0.

---

*[Clinical trials dataset](/datasets/clinical-trials) · CC0 1.0*