# A Large Randomized Trial of Vitamin D, Omega-3 Fatty Acids and Cognitive Decline

> **NCT01669915** · NA · COMPLETED · sponsor: **Brigham and Women's Hospital** · enrollment: 3424 (actual)

## Conditions studied

- Cognitive Decline

## Interventions

- **DIETARY_SUPPLEMENT:** vitamin D3
- **DRUG:** omega-3 fatty acids (fish oil)
- **DIETARY_SUPPLEMENT:** Vitamin D3 placebo
- **DIETARY_SUPPLEMENT:** Fish oil placebo

## Key facts

- **NCT ID:** NCT01669915
- **Lead sponsor:** Brigham and Women's Hospital
- **Sponsor class:** OTHER
- **Phase:** NA
- **Study type:** INTERVENTIONAL
- **Status:** COMPLETED
- **Start date:** 2011-09-14
- **Primary completion:** 2016-06-08
- **Final completion:** 2021-12-31
- **Target enrollment:** 3424 (ACTUAL)
- **Last updated:** 2023-04-21

## Collaborators

- [object Object]

## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT01669915

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT01669915, "A Large Randomized Trial of Vitamin D, Omega-3 Fatty Acids and Cognitive Decline". Retrieved via AI Analytics 2026-06-22 from https://api.ai-analytics.org/clinical/NCT01669915. Licensed CC0.

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