NOPARK Open Label Extension Study

November 25, 2022 updated by: Haukeland University Hospital
This protocol describes the NOPARK Open Label Extension Study. The NOPARK Open Label Extension study is an optional extension of the clinical phase II NOPARK study. Participants who have been included in the NOPARK study will upon completing their participation in the NOPARK study (i.e., after 52 weeks) be offered to receive the study drug Nicotinamide Riboside (NR) 1200 mg P.O. per day, until the NOPARK trial is completed, and the data analyzed with a conclusion of the primary outcome. Individuals enrolled into the NOPARK Open Label Extension Study will be followed with yearly visits. The goal of the NOPARK Open Label Extension Study is to monitor long term safety and study long term neuroprotective and other biological effects of NR use.

Study Overview




Detailed Description

The primary objective of the NOPARK open label extension study is to monitor NR use for long term safety. The secondary objective of the NOPARK open label study is to monitor long term NR use among PD patients and observe the clinical progression of PD. The NOPARK open label extension study is an open label study, where subjects enrolled in the NOPARK study ( NCT03816020), upon completion of the study, will be offered the NR study drug for continuous use, until the NOPARK study is completed and the primary end-point assessed (31/12/2025). The dose of NR is 1200mg NR daily, divided into 600mg twice daily. The reason for the slightly higher dose compared to NOPARK (i.e., 200mg higher) is the fact that the active compound is now available in capsules of 300mg which cannot be divided. From a clinical and scientific perspective, given current knowledge of safety and efficacy of NR in PD, a dose of 1200 mg is both safe and of a higher potential benefit to patients. The study is multi-site, identical to NOPARK. The primary endpoint of the study, which is safety, will be analyzed using descriptive statistics. The secondary endpoint, which is if long-term NR use delays PD progression will be analyzed using the clinical MDS-UPDRS score. Exploratory objectives will assess PD progression relative to the general PD-population and whether long-term NR use affects methylation metabolism. Stratification of analyses is dependent on the duration of administered NR, sex and age. Exploratory stratification will be done based on results from biological data analysis based on data from NOPARK or blood samples collected in the NOPARK open label extension study.

Study Type


Enrollment (Anticipated)



  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Locations

    • Vestland
      • Bergen, Vestland, Norway, 5021
        • Recruiting
        • Haukeland University Hospital
        • Contact:
        • Contact:
        • Principal Investigator:
          • Charalampos Tzoulis, PhD
        • Sub-Investigator:
          • Haakon Berven, MD

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Child
  • Adult
  • Older Adult

Accepts Healthy Volunteers


Genders Eligible for Study



Inclusion Criteria:

  • Provision of signed and dated informed consent form

Stated willingness to comply with all study procedures and availability for the duration of the study

Participated in the NOPARK study

Exclusion Criteria:

  • Current use of vitamin B3 supplementation or NR supplementation - other than in relation to the NOPARK study

Known allergic reactions to components of the NR

Physical or psychiatric illness that makes them unavailable for follow-up and participation.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Other
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Nicotinamide Riboside
Open Label. Nicotinamide Riboside 1200mg x1 daily
1200mg x1 Nicotinamide Riboside

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Safety: measurement of Adverse Events
Time Frame: 0-3 Years
To assess the safety profile of long-term treatment with oral NR 1200 mg daily.
0-3 Years

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Clinical Outcome: total movement disorders society unified Parkinson disease rating scale (MDS-UPDRS) score. Range 0-199
Time Frame: 0-3 Years
To assess whether the progression of PD during the NOPARK open label extension study differs among individuals who used placebo and individuals who used NR for 52 weeks in the NOPARK study.
0-3 Years

Collaborators and Investigators

This is where you will find people and organizations involved with this study.


  • Principal Investigator: Charalampos Tzoulis, PhD, Neur-Sysmed, Haukeland University Hospital, Norway

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

September 28, 2022

Primary Completion (Anticipated)

December 31, 2025

Study Completion (Anticipated)

December 31, 2025

Study Registration Dates

First Submitted

September 15, 2022

First Submitted That Met QC Criteria

September 15, 2022

First Posted (Actual)

September 21, 2022

Study Record Updates

Last Update Posted (Actual)

November 30, 2022

Last Update Submitted That Met QC Criteria

November 25, 2022

Last Verified

September 1, 2022

More Information

Terms related to this study

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?


IPD Plan Description

All data supporting te publication will be publicly shared with the exception of any sensitive information which can lead to participant identification, as defined by Norwegian law.

IPD Sharing Time Frame

At publication

IPD Sharing Access Criteria

We will publish open access. The data will be publicly available

IPD Sharing Supporting Information Type

  • Study Protocol
  • Statistical Analysis Plan (SAP)
  • Informed Consent Form (ICF)
  • Clinical Study Report (CSR)
  • Analytic Code

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product


Studies a U.S. FDA-regulated device product


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