Clinical Trial of Niagen to Examine Recovery in People With Persistent Cognitive and Physical Symptoms After COVID-19
Public ClinicalTrials.gov record NCT04809974. Field values are reproduced from the official study page; the official ClinicalTrials.gov record remains the source of truth for eligibility, enrollment, and contact information.
Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.
Official title
Randomized, Placebo-controlled Parallel Group Clinical Trial of Nicotinamide Riboside to Evaluate NAD+ Levels in Individuals With Persistent Cognitive and Physical Symptoms After COVID-19 Illness ("Long-COVID")
Study identification
- NCT ID
- NCT04809974
- Recruitment status
- Completed
- Study type
- Interventional
- Phase
- Phase 4
- Lead sponsor
- Massachusetts General Hospital
- Other
- Enrollment
- 72 participants
Conditions and interventions
Conditions
Interventions
- Niagen Drug
Drug
Eligibility (public fields only)
- Age range
- 18 Years to 65 Years
- Sex
- All
- Healthy volunteers
- Healthy volunteers not accepted
This page does not interpret eligibility. Detailed inclusion and exclusion criteria are on the official ClinicalTrials.gov record.
Study timeline
- Start date
- Aug 27, 2021
- Primary completion
- Oct 4, 2023
- Completion
- Feb 22, 2024
- Last update posted
- Aug 4, 2025
2021 – 2024
United States locations
- U.S. sites
- 1
- U.S. states
- 1
- U.S. cities
- 1
| Facility | City | State | ZIP | Site status |
|---|---|---|---|---|
| Clinical Translational Research Unit | Boston | Massachusetts | 02129 | — |
Site contact phone numbers, emails, and investigator names are intentionally not displayed here. Open the official ClinicalTrials.gov record for site contact information.
About this trial record page
- What this page shows
- Public field values for ClinicalTrials.gov record NCT04809974, including study identification, conditions, interventions, eligibility (age, sex, healthy volunteer), timeline, and U.S. site list.
- What this page does not do
- No medical advice, eligibility judgments, treatment recommendations, study quality scoring, or AI-generated medical summaries. No site contact phone numbers, emails, or investigator names.
- Where the data comes from
- Sourced from the official ClinicalTrials.gov public API. The official record is the source of truth.
- Last refresh
- Last update posted Aug 4, 2025 · Synced Apr 29, 2026
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Open the official record
The complete protocol, eligibility criteria, and contact information for NCT04809974 live on ClinicalTrials.gov.