A Study Evaluation the Safety and Efficacy of Hormone Replacement Therapy With North Star Compared to Levothyroxine in Patients With Primary Hypothyroidism

February 16, 2026 updated by: Neuvosyn Laboratories, LLC

A Randomized, Double-blind, Dose-Conversion Study to Evaluate the Safety and Efficacy of Hormone Replacement Therapy With North Star Compared to Levothyroxine in Subjects With Primary Hypothyroidism Who Are Euthyroid on Levothyroxine Replacement Therapy

The North Star study is a multi-center, Phase 2, double-blind, randomized, parallel group clinical study to evaluate the safe and effective dose conversion from Levothyroxine to North Star therapy.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
303

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 2

Contacts and Locations

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

Study Locations

  • United States
    • Alabama
      • Birmingham, Alabama, United States, 35209
        • Neuvosyn Investigational Site
    • California
      • Canoga Park, California, United States, 91304
        • Neuvosyn Investigational Site
      • Greenbrae, California, United States, 94904
        • Neuvosyn Investigational Site
      • Toluca Lake, California, United States, 91602
        • Neuvosyn Investigational Site
    • Connecticut
      • Farmington, Connecticut, United States, 06030
        • Neuvosyn Investigational Site
    • Florida
      • Boca Raton, Florida, United States, 33434
        • Neuvosyn Investigational Site
      • Miami, Florida, United States, 33144
        • Neuvosyn Investigational Site
      • Miami, Florida, United States, 33145
        • Neuvosyn Investigational Site
      • Miami, Florida, United States, 33155
        • Neuvosyn Investigational Site
      • Miami, Florida, United States, 33174
        • Neuvosyn Investigational Site
      • Miami, Florida, United States, 33179
        • Neuvosyn Investigational Site
      • Sunrise, Florida, United States, 33351
        • Neuvosyn Investigational Site
    • Georgia
      • Acworth, Georgia, United States, 30101
        • Neuvosyn Investigational Site
      • Atlanta, Georgia, United States, 30318
        • Neuvosyn Investigational Site
      • Columbus, Georgia, United States, 31904
        • Neuvosyn Investigational Site
      • Sugar Hill, Georgia, United States, 30024
        • Neuvosyn Investigational Site
    • Michigan
      • Saginaw, Michigan, United States, 48602
        • Neuvosyn Investigational Site
    • Missouri
      • Gladstone, Missouri, United States, 64118
        • Neuvosyn Investigational Site
    • New York
      • Williamsville, New York, United States, 14221
        • Neuvosyn Investigational Site
    • North Carolina
      • Denver, North Carolina, United States, 28037
        • Neuvosyn Investigational Site
      • Winston-Salem, North Carolina, United States, 27103
        • Neuvosyn Investigational Site
    • Ohio
      • Beavercreek, Ohio, United States, 45440
        • Neuvosyn Investigational Site
      • Columbus, Ohio, United States, 31904
        • Neuvosyn Investigational Site
    • Texas
      • Georgetown, Texas, United States, 78628
        • Neuvosyn Investigational Site
      • Houston, Texas, United States, 77040
        • Neuvosyn Investigational Site
      • Katy, Texas, United States, 77450
        • Neuvosyn Investigational Site
      • Katy, Texas, United States, 77494
        • Neuvosyn Investigational Site
      • Lewisville, Texas, United States, 75067
        • Neuvosyn Investigational Site
      • Paris, Texas, United States, 75462
        • Neuvosyn Investigational Site
      • Pearland, Texas, United States, 77584
        • Neuvosyn Investigational Site
      • Stafford, Texas, United States, 77477
        • Neuvosyn Investigational Site

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

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

18 years to 75 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Diagnosed with primary hypothyroidism
  • On continuous thyroid replacement therapy for at least 6 months before Study Entry
  • On a stable daily dose of LT4 for a minimum of 12 weeks prior to Screening
  • Agree to practice a method of contraception
  • Female patients not pregnant or lactating at Screening
  • Agree to practice a method of contraception of greater than 90% reliability
  • Willing to give written informed consent for the Study
  • Provide written authorization for use and disclosure of protected health information

Exclusion Criteria:

  • Any clinical condition or previous surgery that might affect the absorption, distribution, biotransformation or excretion of North Star or levothyroxine
  • Hospitalization for a major illness within 4 weeks prior to Screening
  • Anticipated initiation or change in concomitant medications
  • Concomitant use of prohibited medications or supplements
  • Participated in another investigational new drug study within 30 days or 5 half-lives of the IMP, whichever is longer, prior to the first study drug administration.
  • For female subjects, be pregnant, nursing or planning to become pregnant during the study

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: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Quadruple

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Active Comparator: Levothyroxine
Drug: Levothyroxine
Levothyroxine
Experimental: North Star
Drug: North Star
North Star

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Time Frame
The ratio of the LT4 dose (mcg/day) at screening to North Star (mg/day) at the end of the treatment period required to achieve and maintain serum thyroid-stimulating hormone (TSH) levels within the normal reference range.
Time Frame: Week 30
Week 30

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Time Frame
Proportion of subjects who are euthyroid as determined by serum TSH level within the normal reference range at the end of the treatment period.
Time Frame: Week 30
Week 30

Collaborators and Investigators

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

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Neuvosyn Laboratories, LLC

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. 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)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
February 28, 2023

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
May 5, 2025

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
September 18, 2025

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
January 18, 2023

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
January 25, 2023

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
February 3, 2023

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
February 18, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
February 16, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
February 1, 2026

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • NorthStar-02-001

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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