Vitamin D Supplementation and PTH Response Among Malaysian Adults

March 10, 2022 updated by: Melissa Leong En Ying, International Medical University

Vitamin D Supplementation, Parathyroid Hormone (PTH) and Plasma Vitamin D Response Among Malaysian Female Adults: Double Blinded, Randomised Clinical Trial of Efficacy

This clinical trial was designed to determine the efficacy of vitamin D supplementation on plasma 25-hydroxyvitamin D [25(OH)D] and intact parathyroid hormone (PTH) concentrations of Malaysian female adults of child-bearing age after daily intake of vitamin D supplements containing either 0 IU, 600 IU, 1200 IU or 4000 IU vitamin D for 16 weeks.

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.

Detailed Description

After being informed regarding the study protocol and requirements, participants given informed consent were interviewed using a questionnaire for collection of background data and medical history as a screening process. Eligible participants were randomly assigned in a double-blind manner to receive daily 500 mg of calcium with either 0, 600 IU, 1200 IU or 4000 IU vitamin D supplement for 16 weeks. Questionnaires and anthropometric measurements were collected at baseline and post 16 weeks supplementation trial. Primary outcomes of plasma 25(OH)D and intact PTH were measured via fasting intravenous blood samples at baseline and post 16 weeks trial.

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.
106

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.
  • Early Phase 1

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

  • Malaysia
    • Wilayah Persekutuan Kuala Lumpur
      • Kuala Lumpur, Wilayah Persekutuan Kuala Lumpur, Malaysia, 57000
        • International Medical University

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

20 years to 45 years (Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

Female

Description

Inclusion Criteria:

  • three major ethnic groups (Malay, Chinese, Indian)
  • age 20-45 years

Exclusion Criteria:

  • any diseases or conditions that may affect vitamin D metabolism, such as diabetes, cardiovascular diseases, bone diseases, autoimmune diseases, had major gastrointestinal surgery and diagnosed primary hyperparathyroidism
  • medications that might affect vitamin D metabolism, such as insulin, thiazide diuretics, prednisolone, biphosphonates, tamoxifen and phenytoin
  • pregnant and lactating women

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: Basic Science
  • Allocation: Randomized
  • Interventional Model: Factorial Assignment
  • Masking: Double

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.
Placebo Comparator: Placebo, 500 mg calcium
Participants received 500 mg calcium in berry flavoured sachet powder daily for 16 weeks
Dietary supplement: Placebo, 500 mg calcium
Berry flavoured sachet powder (500 mg calcium)
Dietary supplement: 600 IU vitamin D + 500 mg calcium
Berry flavoured sachet powder (600 IU vitamin D + 500 mg calcium)
Dietary supplement: 1200 IU vitamin D + 500 mg calcium
Berry flavoured sachet powder (1200 IU vitamin D + 500 mg calcium)
Dietary supplement: 4000 IU vitamin D + 500 mg calcium
Berry flavoured sachet powder (4000 IU vitamin D + 500 mg calcium)
Active Comparator: 600 IU vitamin D + 500 mg calcium
Participants received 600 IU vitamin D with 500 mg calcium in berry flavoured sachet powder daily for 16 weeks
Dietary supplement: Placebo, 500 mg calcium
Berry flavoured sachet powder (500 mg calcium)
Dietary supplement: 600 IU vitamin D + 500 mg calcium
Berry flavoured sachet powder (600 IU vitamin D + 500 mg calcium)
Dietary supplement: 1200 IU vitamin D + 500 mg calcium
Berry flavoured sachet powder (1200 IU vitamin D + 500 mg calcium)
Dietary supplement: 4000 IU vitamin D + 500 mg calcium
Berry flavoured sachet powder (4000 IU vitamin D + 500 mg calcium)
Active Comparator: 1200 IU vitamin D + 500 mg calcium
Participants received 1200 IU vitamin D with 500 mg calcium in berry flavoured sachet powder daily for 16 weeks
Dietary supplement: Placebo, 500 mg calcium
Berry flavoured sachet powder (500 mg calcium)
Dietary supplement: 600 IU vitamin D + 500 mg calcium
Berry flavoured sachet powder (600 IU vitamin D + 500 mg calcium)
Dietary supplement: 1200 IU vitamin D + 500 mg calcium
Berry flavoured sachet powder (1200 IU vitamin D + 500 mg calcium)
Dietary supplement: 4000 IU vitamin D + 500 mg calcium
Berry flavoured sachet powder (4000 IU vitamin D + 500 mg calcium)
Active Comparator: 4000 IU vitamin D + 500 mg calcium
Participants received 4000 IU vitamin D with 500 mg calcium in berry flavoured sachet powder daily for 16 weeks
Dietary supplement: Placebo, 500 mg calcium
Berry flavoured sachet powder (500 mg calcium)
Dietary supplement: 600 IU vitamin D + 500 mg calcium
Berry flavoured sachet powder (600 IU vitamin D + 500 mg calcium)
Dietary supplement: 1200 IU vitamin D + 500 mg calcium
Berry flavoured sachet powder (1200 IU vitamin D + 500 mg calcium)
Dietary supplement: 4000 IU vitamin D + 500 mg calcium
Berry flavoured sachet powder (4000 IU vitamin D + 500 mg calcium)

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
Measure Description
Time Frame
Change from baseline plasma 25-hydroxyvitamin D at week 16
Time Frame: Baseline and week 16
5ml of fasting blood sample were taken by venepuncture into heparin tubes. Collected blood samples were centrifuged at 4000 rpm for 10 minutes, extracted plasma and stored at -80˚C until sent for analysis
Baseline and week 16

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
Measure Description
Time Frame
Change from baseline intact parathyroid hormone at week 16
Time Frame: Baseline and week 16
5ml of fasting blood sample were taken by venepuncture into heparin tubes. Collected blood samples were centrifuged at 4000 rpm for 10 minutes, extracted plasma and stored at -80˚C until sent for analysis
Baseline and week 16

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.
International Medical University

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Study Chair: Geok Lin Khor, International Medical University
  • Study Director: Megan Chong, International Medical University

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.
July 10, 2015

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.
September 26, 2016

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.
October 1, 2016

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).
February 28, 2022

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.
March 10, 2022

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.
March 16, 2022

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.
March 16, 2022

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.
March 10, 2022

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.
March 1, 2022

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.
  • IMU R 144/2014 - File II

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

IPD Plan Description

Data cannot be shared publicly because of shared IPs. Data are available from the International Medical University Institutional Data Access (contact via khor.geoklin@gmail.com) for researchers who meet the criteria for access to confidential data

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

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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