This investigation was conducted to evaluate comparison of myo-inositol and metformin on glycemic control, lipid profiles, and gene expression related to insulin and lipid metabolism in women with polycystic ovary syndrome (PCOS). This randomized controlled trial was conducted on 53 women with PCOS, aged 18-40 years old. Subjects were randomly allocated into two groups to take either myo-inositol (n = 26) or metformin (n = 27) for 12 weeks. Myo-inositol supplementation, compared with metformin, significantly reduced fasting plasma glucose (FPG) (β -5.12 mg/dL; 95% CI, -8.09, -2.16; p=.001), serum insulin levels (β -1.49 µIU/mL; 95% CI, -2.28, -0.70; p<.001), homeostasis model of assessment-insulin resistance (β -0.36; 95% CI, -0.55, -0.17; p<.001), serum triglycerides (β 12.42 mg/dL; 95% CI, -20.47, -4.37; p=.003) and VLDL-cholesterol levels (β -2.48 mg/dL; 95% CI, -4.09, -0.87; p=.003), and significantly increased the quantitative insulin sensitivity check index (β 0.006; 95% CI, 0.002, 0.01; p=.006) compared with metformin. Moreover, myo-inositol supplementation upregulated gene expression of peroxisome proliferator-activated receptor gamma (PPAR-γ) (p=.002) compared with metformin. Overall, taking myo-inositol, compared with metformin, for 12 weeks by women with PCOS had beneficial effects on glycemic control, triglycerides and VLDL-cholesterol levels, and gene expression of PPAR-γ.
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