Momordica charantia (Bitter Melon) for Glycemic Control in Diabetes: A Systematic Review

Abstract

Introduction: Bitter melon is a vegetable and traditional remedy used across Asia for its glucose-lowering properties. Despite its widespread use, its clinical efficacy is not well established. This review synthesizes the evidence from clinical trials on its effect on diabetes.

Methods: A comprehensive search was performed for RCTs that compared bitter melon in any form (juice, extract, powder) to placebo or active anti-diabetic drugs. The primary outcome was the change in HbA1c.

Results: Seventeen RCTs were included. The results were highly inconsistent. While some smaller studies showed a statistically significant reduction in FBG, the majority of more rigorous trials found no significant difference in HbA1c levels between bitter melon and placebo groups.

Discussion: The current evidence for the efficacy of bitter melon in managing diabetes is weak and contradictory. The lack of standardized preparations and poor methodological quality of many studies are major limitations.

Conclusion: There is insufficient high-quality evidence to recommend bitter melon for glycemic control in diabetic patients.