(1) Aim of study: Evaluation the effects of Saffron extract on rheumatoid arthritis disease activity in newly diagnosed patients. (2) Major inclusion and exclusion criteria: All the patients with completed informed consent form and with diagnosis of rheumatoid arthritis disease who didn't receive any treatment and with over 18 years old will be included in the study. (3) Study population and sample size: 60 patients with newly diagnosed Rheumatoid Arthritis. (4) Study Intervention: In intervention group, patients will receive Saffron pill containing 100 mg Saffron extract once a day for 4 months in addition to standard treatment including: 5 mg Prednisolone daily, 7.5 mg oral Methotrexate weekly, 5 mg Folic acid weekly, 400 IU Vitamin D daily, 800 mg Calcium daily, 70 mg Alendronate weekly. In the control group, patients will receive Placebo pill containing "Sunset" paint once a day for 4 months in addition to standard treatment the same as intervention group. (5) Primary outcomes: Disease activity level, in the beginning of study and 1, 2.5, and 4 months after study initiation, will be evaluated using determined formula for DAS28-ESR, which is on the basis of physical examination, ESR level, and patient self assessment.