The aim of this study is to determine the effect of oral quercetin supplement intake on oxidative markers , serum iron, liver enzymes and inflammatory indices in β-thalassemia major patients. 84 beta thalassemia major patieents, 18 to 30 years old with serume ferritin level between 2500 to 3500 ng/ml and iron chelation therapy with desferrioxamine will be enrolled and allocated double-blinded and randomly to the quercetin or the placebo group. The quercetin group will recieve a 500 mg quercetin tablet each day and the placebo group will recieve a 500 mg starch tablet each day for 3 months. There will be two blood specimen collection before and after the intervention to measure Malondialdehyde (MDA), Super Oxide Dismutase (SOD) and Glutathione peroxidase (GPx), total antioxidant capacity (TAC) as the primary outcomes and serum iron, ferritin, transferrin, total iron binding capacity (TIBC), transferrin saturation (TS), Alanine transaminase (ALT), Aspartate transaminase (AST), Alkaline phosphatase (ALP), high-sensitivity C-reactive protein (hs-CRP) and tumor necrosis factor (TNF) as the secondry outcomes.