Effect of Vitamin D Supplementation on Testosterone Level in Women With Polycystic Ovary Syndrome

Bangabandhu Sheikh Mujib Medical University, Dhaka, Bangladesh (Other)
Overall Status
CT.gov ID

Study Details

Study Description

Brief Summary

The goal of this randomized, double blind, placebo-controlled clinical trial is to learn about, the effect of low dose vitamin D supplementation compares with placebo-controlled group on testosterone level in women with polycystic ovary syndrome. Half of Participants will receive vitamin D and metformin while other half placebo and metformin.

Condition or Disease Intervention/Treatment Phase
  • Drug: Vitamin D3
  • Drug: Placebo Oral Tablet
Phase 2

Detailed Description

PCOS poses a significant challenge to women's health and quality of life. PCOS is a common heterogenous endocrine disorder in reproductive-aged women. PCOS is characterized by the presence of polycystic ovaries, menstrual dysfunction, infertility and biochemical (elevated androgens) and clinical (hirsutism and/or acne) hyperandrogenism. Hyperandrogenism and insulin resistance exacerbate one another in the development of PCOS, Research has suggested a potential link between Vitamin D deficiency and the prevalence and severity of PCOS. There is also evidence that Vitamin D has a direct effect on the ovaries and adrenal glands, which are the primary sites of androgen production in women. Vitamin D has been found to inhibit the synthesis of androgens in these glands, suggesting that it could potentially be used to manage hyperandrogenism in women with PCOS. Furthermore, studies have shown that Vitamin D supplementation can reduce insulin resistance in women with PCOS, which can subsequently lead to a decrease in the overproduction of androgens. may improves menstrual irregularities.

In human ovarian tissue, vitamin D stimulation of oestrogen and progesterone production and lack of effect on testosterone production may be explained by the expression of the aromatase gene and augmentation of aromatase activity by vitamin D.

Serum 25OH-D level has been shown to be negatively correlated with serum androgen levels DHEAS, testosterone and hirsutism. Assumption that vitamin D supplementation may also have a positive impact on serum testosterone levels. Metformin is prescribed for reducing IR in PCOS women. This is a double-blind, randomized placebo-controlled trial in PCOS women who are receiving Metformin therapy. The intervention group will receive Vitamin D Cholecalciferol (D3) 1000 I.U daily for 8 weeks, with the Metformin as prescribed by the physician whereas control group will receive placebo with Metformin during the study period. We will compare change of Total Testosterone, Vitamin D level, Fasting blood glucose, Hirsutism, Menstrual regularities and BMI, at the time of recruitment with after 8 weeks intervention in both the intervention and placebo controlled groups.

Study Design

Study Type:
Anticipated Enrollment :
66 participants
Intervention Model:
Parallel Assignment
Triple (Participant, Care Provider, Investigator)
Primary Purpose:
Official Title:
Effect of Vitamin D Supplementation on Testosterone Level in Women With Polycystic Ovary Syndrome: A Randomized, Double-blind, Placebo-controlled Trial
Actual Study Start Date :
Sep 21, 2023
Anticipated Primary Completion Date :
Apr 30, 2024
Anticipated Study Completion Date :
Jun 30, 2024

Arms and Interventions

Arm Intervention/Treatment
Experimental: Vitamin D group

Drug: Vitamin D3
These patients will receive Vitamin D3 1000 I.U daily and the Metformin as prescribed by the physician for 8 weeks.

Placebo Comparator: Placebo group

Drug: Placebo Oral Tablet
These patients will receive placebo and the Metformin as prescribed by the physician for the same periods of study group

Outcome Measures

Primary Outcome Measures

  1. Total Testosterone [1 year]

    The estimated testosterone level, is 15-46 ng/dL for a reproductive aged normal menstrual cycles woman . The results demonstrate that there is a diurnal rhythm of testosterone secretion during in girls, with the highest levels in the morning 6 am-10 am .Biochemical hyperandrogenism (TT >46 ng/dl)

Secondary Outcome Measures

  1. Fasting blood glucose [1 year]

    Impaired fasting glucose (IFG) when FBG is between 5.6-6.9 mmol/L

  2. Menstrual regularity [1 year]

    Polymenorrheic (<21 days), Eumenorrheic (21 - 35 days), Oligomenorrheic (36 days - 3 months) and Amenorrheic (>3 months)

  3. Hirsutism [1 year]

    mFG score of ≥6

  4. Vitamin D [1 Year]

    A blood level of less than 20 ng/ml is considered deficiency, insufficiency is 21- 29 ng/ml, and sufficiency is 30 ng/ml or higher.

  5. BMI [1 Year]

    Status BMI Underweight 15-19.9 Normal weight 20-24.9 Overweight 25-29.9 Class I Obesity 30-34.9 Class II Obesity 35-39.9 Class III Obesity ≥ 40

Eligibility Criteria


Ages Eligible for Study:
18 Years to 45 Years
Sexes Eligible for Study:
Accepts Healthy Volunteers:
Inclusion Criteria:
  • Diagnosed case of PCOS

Age 18 years to 45 years

Exclusion Criteria:
  • Pregnancy, lactating women

Diagnosed case of diabetes mellitus, liver disease, heart disease, kidney stones and disease, Tuberculosis, hyperparathyroidism

Patients receiving vitamin D, calcium supplementation within the last two months

Known hypersensitivity to Vitamin D

Patients unwilling to participate or unwilling to give written consent

Contacts and Locations


Site City State Country Postal Code
1 BSMMU Dhaka Bangladesh 1000

Sponsors and Collaborators

  • Bangabandhu Sheikh Mujib Medical University, Dhaka, Bangladesh


  • Principal Investigator: Nilufar Yasmin, MD, Bangabandhu Sheikh Mujib Medical University, Dhaka, Bangladesh

Study Documents (Full-Text)

None provided.

More Information


None provided.
Responsible Party:
Nilufar Yasmin, Resident, MD, Bangabandhu Sheikh Mujib Medical University, Dhaka, Bangladesh
ClinicalTrials.gov Identifier:
Other Study ID Numbers:
  • BSMMU/2023/11021
First Posted:
Oct 26, 2023
Last Update Posted:
Oct 31, 2023
Last Verified:
Oct 1, 2023
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD:
Studies a U.S. FDA-regulated Drug Product:
Studies a U.S. FDA-regulated Device Product:
Keywords provided by Nilufar Yasmin, Resident, MD, Bangabandhu Sheikh Mujib Medical University, Dhaka, Bangladesh
Additional relevant MeSH terms:

Study Results

No Results Posted as of Oct 31, 2023