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Supplementary material The Supplementary material for this article can be found online at: AMSTAR A MeaSurement Tool to Assess systematic Review BMI Body Mass Index CI Confidence Interval CRP C-reactive Protein DHA Docosahexaenoic Acid EPA Eicosapentaenoic Acid FBG Fasting Blood Glucose FG Fasting Glucose FI Fasting Insulin FSH Follicle-Stimulating Hormone GSH Glutathione HDL-C High-Density Lipoprotein Cholesterol HOMA-IR Homeostatic Model Assessment of Insulin Resistance hs-CRP high-sensitivity C-reactive Protein LDL-C Low-Density Lipoprotein Cholesterol LH Luteinizing Hormone MDA Malondialdehyde MD Mean Difference NO Nitric Oxide OR Odds Ratio PCOS Polycystic Ovary Syndrome PRISMA Preferred Reporting Items for Systematic Reviews and Meta-Analyses QUICKI Quantitative Insulin Sensitivity Check Index RCT Randomized Controlled Trial RR Risk Ratio SHBG Sex Hormone-Binding Globulin SMD Standardized Mean Difference TAC Total Antioxidant Capacity TC Total Cholesterol TG Triglycerides vLDL-C very Low-Density Lipoprotein Cholesterol WHR Waist-to-Hip Ratio Glossary References 1

Selenium: Required cofactor for glutathione peroxidase, the enzyme family that uses glutathione to neutralize peroxides

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10.1016/j.jep.2010.08.015 106 LamF