Metabolic syndrome (Mets) is defined as the collection of risk factors contributing to type 2 diabetes mellitus and cardiovascular disease. Mets is accompanied by oxidative stress and low-grade inflammation. Green coffee is rich in polyphenols called chlorogenic acids (CGA) which possess anti-inflammatory and anti-oxidative characteristics. Thus, we carried out this trial to examine green coffee extract (GCE) effects on oxidative stress, systemic and vascular inflammation in patients having Mets