Safety IssuesNCT05546567
NOPARK Open Label Extension Study
A study testing Nicotinamide Riboside in people with Safety Issues, run by Haukeland University Hospital at 1 site in Norway.
Trial summary
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… Read more about this study
- Who is it for?
- Any age
- Conditions the study is for
- Safety Issues
- What is being tested?
- Nicotinamide Riboside
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 400 participants
- Where
- 1 siteNorway
- Study dates
- 28 Sep 2022to 20 Jun 2025
- Phase
- Interventional
- Are there results?
- Not yet: the study is under way
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages Any age
- All sexes
- No healthy volunteers
- Child, Adult, Older adult
Who may be able to join
- 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
Who cannot join
- 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.
Trial locations and contacts
1 site in 1 country.
About this study
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.
Read the 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 (ClinicalTrials.gov: 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.
- Conditions
- Safety Issues
- Being tested
- Nicotinamide Riboside
- Keywords
- Parkinson's disease, Nicotinamide Riboside, Open Label
- Medical subject headings
- Parkinson Disease
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Nicotinamide RibosideDietary supplement
1200mg x1 Nicotinamide Riboside
| Study group | Role | What they receive |
|---|---|---|
| Nicotinamide Riboside | Experimental | Open Label. Nicotinamide Riboside 1200mg x1 daily Receives: Dietary Supplement: Nicotinamide Riboside |
What is being measured
The primary outcome is the main question the study is designed to answer.
Safety: measurement of Adverse Events
To assess the safety profile of long-term treatment with oral NR 1200 mg daily.
Measured: 0-3 Years
Secondary outcomes (1)
Clinical Outcome: total movement disorders society unified Parkinson disease rating scale (MDS-UPDRS) score. Range 0-199
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.
Measured: 0-3 Years
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted21 Sep 2022
- Study start28 Sep 2022
- Primary completion20 Jun 2025 (estimated)
- Study completion20 Jun 2025 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (5)Papers the sponsor has linked to this study.
- Other trials for Safety IssuesStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Other
- Allocation
- Not applicable
- Intervention model
- Single group
- Model description
- Open label single group
- Masking
- None (open label)
- Enrolment
- 400 participants (estimated)
Sponsor and investigators
- Lead sponsor
- Haukeland University Hospital
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor
- Investigators
- Charalampos Tzoulis, PhD, Principal investigator, Neur-Sysmed, Haukeland University Hospital, Norway
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT05546567
- Sponsor's protocol ID
- 457567
- Status last verified
- May 2025
- First submitted
- 15 Sep 2022
- Last updated
- 30 May 2025
- Results posted
- No
- Data monitoring committee
- Yes
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- Yes: 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.
Publications
Brakedal B, Dolle C, Riemer F, Ma Y, Nido GS, Skeie GO, Craven AR, Schwarzlmuller T, Brekke N, Diab J, Sverkeli L, Skjeie V, Varhaug K, Tysnes OB, Peng S, Haugarvoll K, Ziegler M, Gruner R, Eidelberg D, Tzoulis C. The NADPARK study: A randomized phase I trial of nicotinamide riboside supplementation in Parkinson's disease. Cell Metab. 2022 Mar 1;34(3):396-407.e6. doi: 10.1016/j.cmet.2022.02.001.
PubMed 35235774Dollerup OL, Christensen B, Svart M, Schmidt MS, Sulek K, Ringgaard S, Stodkilde-Jorgensen H, Moller N, Brenner C, Treebak JT, Jessen N. A randomized placebo-controlled clinical trial of nicotinamide riboside in obese men: safety, insulin-sensitivity, and lipid-mobilizing effects. Am J Clin Nutr. 2018 Aug 1;108(2):343-353. doi: 10.1093/ajcn/nqy132.
PubMed 29992272Conze DB, Crespo-Barreto J, Kruger CL. Safety assessment of nicotinamide riboside, a form of vitamin B3. Hum Exp Toxicol. 2016 Nov;35(11):1149-1160. doi: 10.1177/0960327115626254. Epub 2016 Jul 11.
PubMed 26791540Conze D, Brenner C, Kruger CL. Safety and Metabolism of Long-term Administration of NIAGEN (Nicotinamide Riboside Chloride) in a Randomized, Double-Blind, Placebo-controlled Clinical Trial of Healthy Overweight Adults. Sci Rep. 2019 Jul 5;9(1):9772. doi: 10.1038/s41598-019-46120-z.
PubMed 31278280EFSA Panel on Nutrition, Novel Foods and Food Allergens (NDA); Turck D, Bohn T, Castenmiller J, De Henauw S, Hirsch-Ernst KI, Maciuk A, Mangelsdorf I, McArdle HJ, Naska A, Pelaez C, Pentieva K, Siani A, Thies F, Tsabouri S, Vinceti M, Cubadda F, Frenzel T, Heinonen M, Prieto Maradona M, Marchelli R, Neuhauser-Berthold M, Poulsen M, Schlatter JR, van Loveren H, Albert O, de Sesmaisons Lecarre A, Knutsen HK. Extension of use of nicotinamide riboside chloride as a novel food pursuant to Regulation (EU) 2015/2283. EFSA J. 2021 Nov 12;19(11):e06843. doi: 10.2903/j.efsa.2021.6843. eCollection 2021 Nov.
PubMed 34804232
Study at a glance
From the registry record, last updated by the sponsor on 30 May 2025. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- NOPARK Open Label Extension Study
- ClinicalTrials.gov ID
- NCT05546567
- Acronym / sponsor ID
- 457567
- Conditions
- Safety Issues
- Keywords
- Parkinson's disease, Nicotinamide Riboside, Open Label
- Study type
- Interventional
- Recruitment status
- Active, not recruiting
- Enrolment
- 400 participants (estimated)
- Lead sponsor
- Haukeland University HospitalUniversity, hospital or other
- Study start
- 28 Sep 2022 (actual)
- Primary completion
- 20 Jun 2025 (estimated)
- Study completion
- 20 Jun 2025 (estimated)
- First posted
- 21 Sep 2022 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
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.
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 (ClinicalTrials.gov: 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 design
- Primary purpose
- Other
- Allocation
- Not applicable
- Intervention model
- Single group
- Masking
- None (open label)
- Number of arms
- 1
- Model description
- Open label single group
| Arm | Type | Receives |
|---|---|---|
| Nicotinamide Riboside | Experimental | Dietary Supplement: Nicotinamide RibosideOpen Label. Nicotinamide Riboside 1200mg x1 daily |
Who may qualify
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Child, Adult, Older adult
Key inclusion criteria (3 listed)
- 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
Key exclusion criteria (3 listed)
- 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.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Nicotinamide Riboside1200mg x1 Nicotinamide Riboside | Dietary supplement | Nicotinamide Riboside |
Primary outcome
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.
1 secondary outcome
Clinical Outcome: total movement disorders society unified Parkinson disease rating scale (MDS-UPDRS) score. Range 0-199
Time frame: 0-3 Years
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 30 May 2025.
- Background: PubMed 35235774Brakedal B, Dolle C, Riemer F, Ma Y, Nido GS, Skeie GO, Craven AR, Schwarzlmuller T, Brekke N, Diab J, Sverkeli L, Skjeie V, Varhaug K, Tysnes OB, Peng S, Haugarvoll K, Ziegler M, Gruner R, Eidelberg D, Tzoulis C. The NADPARK study: A randomized phase I trial of nicotinamide riboside supplementation in Parkinson's disease. Cell Metab. 2022 Mar 1;34(3):396-407.e6. doi: 10.1016/j.cmet.2022.02.001.
- Background: PubMed 29992272Dollerup OL, Christensen B, Svart M, Schmidt MS, Sulek K, Ringgaard S, Stodkilde-Jorgensen H, Moller N, Brenner C, Treebak JT, Jessen N. A randomized placebo-controlled clinical trial of nicotinamide riboside in obese men: safety, insulin-sensitivity, and lipid-mobilizing effects. Am J Clin Nutr. 2018 Aug 1;108(2):343-353. doi: 10.1093/ajcn/nqy132.
- Background: PubMed 26791540Conze DB, Crespo-Barreto J, Kruger CL. Safety assessment of nicotinamide riboside, a form of vitamin B3. Hum Exp Toxicol. 2016 Nov;35(11):1149-1160. doi: 10.1177/0960327115626254. Epub 2016 Jul 11.
- Background: PubMed 31278280Conze D, Brenner C, Kruger CL. Safety and Metabolism of Long-term Administration of NIAGEN (Nicotinamide Riboside Chloride) in a Randomized, Double-Blind, Placebo-controlled Clinical Trial of Healthy Overweight Adults. Sci Rep. 2019 Jul 5;9(1):9772. doi: 10.1038/s41598-019-46120-z.
- Background: PubMed 34804232EFSA Panel on Nutrition, Novel Foods and Food Allergens (NDA); Turck D, Bohn T, Castenmiller J, De Henauw S, Hirsch-Ernst KI, Maciuk A, Mangelsdorf I, McArdle HJ, Naska A, Pelaez C, Pentieva K, Siani A, Thies F, Tsabouri S, Vinceti M, Cubadda F, Frenzel T, Heinonen M, Prieto Maradona M, Marchelli R, Neuhauser-Berthold M, Poulsen M, Schlatter JR, van Loveren H, Albert O, de Sesmaisons Lecarre A, Knutsen HK. Extension of use of nicotinamide riboside chloride as a novel food pursuant to Regulation (EU) 2015/2283. EFSA J. 2021 Nov 12;19(11):e06843. doi: 10.2903/j.efsa.2021.6843. eCollection 2021 Nov.
- Individual participant dataSharing planned: Yes. 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.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Charalampos Tzoulis, PhD principal investigator
Neur-Sysmed, Haukeland University Hospital, Norway
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Nicotinamide Riboside in people with Safety Issues, run by Haukeland University Hospital at 1 site in Norway.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 3 inclusion and 3 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: under way, not looking for participants, as of the sponsor's last update on 30 May 2025. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Norway. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Safety: measurement of Adverse Events (time frame: 0-3 Years). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT05546567, which also lists 5 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 30 May 2025.