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Comparative Effectiveness of Metformin, Inositol, Dietary Restriction, and Combination Therapy in Polycystic Ovary Syndrome: A 12-Week Prospective Randomized Study

ClinicalTrials.gov · COMPLETED, 2026

192 participants

Abstract

Polycystic ovary syndrome (PCOS) is a common condition that can cause irregular periods, excess male-type hormones, weight gain, and insulin resistance. This study will compare four commonly used approaches for PCOS management: metformin, inositol, a calorie-restricted diet, and a combination of all three.

A total of 192 women aged 18-35 years with PCOS (diagnosed using Rotterdam criteria) will be randomly assigned to one of four groups for 12 weeks: (A) metformin, (B) myo-inositol plus D-chiro-inositol, (C) calorie-restricted diet, or (D) combination therapy (metformin + inositol + diet). The study will assess changes in body weight, body mass index (BMI), waist circumference, fasting glucose, fasting insulin, insulin resistance (HOMA-IR), and menstrual regularity. Hormonal measures and safety outcomes will also be evaluated. The goal is to determine which approach provides the greatest overall metabolic and reproductive benefit in women with PCOS.

Conditions: Polycystic Ovary Syndrome, Insulin Resistance, Metabolic Syndrome.

Primary outcome: Change in insulin resistance (HOMA-IR).

Enrollment: 192 participants.

How strong is the evidence?

Evidence Hub reads this as a randomized trial, done in people. Its evidence level is 2 of 5 (High · randomized trial). Randomized trials of a reasonable size are the strongest single-study design. Reported size: 192 participants or records.

How the five levels of evidence work. The level is assigned automatically from the abstract and can be wrong, so check the paper.

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