IRCT20190303042905N1 IRCT 2019-05-17 Ahvaz University of Medical Sciences The effects of melatonin supplementation on type 2 diabetes mellitus The effects of melatonin supplementation on mean arterial pressure, pulse pressure, atherogenic index of plasma and new anthropometric index in type 2 diabetes mellitus patients 2019-03-03 anticipated 50 Complete https://irct.ir/trial/38114 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Used, Assignment: Parallel, Purpose: Supportive, Randomization description: Based on inclusion criteria, 50 patients will be randomly allocated to placebo (n = 25) or intervention (n = 25) groups. Block design based on the combined analysis will be used for randomization. In fact, according to pattern and using two codes of A and B 6 groups with 4 blocks will be select. This work is repeated in 2 steps. At the end, two A and B codes will be assign to the 2 last people and the randomization will be complete (50 patients), Blinding description: Patients with type 2 diabetes who go to the diabetes Clinic of Department of Golestan Hospital are selected. Participants in this study and person who responsible for data collection are not aware of the type of drug used. َAlso, the researchers and patients are not aware of the contents of the packets (a double-blind). The coding in this study will be done by a person outside the study who has information about diabetes and knows what code is related to supplement and which is related to placebo. But do not have much information about the details of our research methods. 2 type 2 diabetes. Intervention 1: Intervention group:intervention group receive two melatonin tablets(Nature Made, USA) (3 mg) per day for 60 days. Intervention 2: Control group: The control group receive 2 tablets of placebo 3 mg per day containing cellulose, silicone dioxide and starch (made by the Faculty of Pharmacy, Ahvaz Jundishapur University of Medical Sciences) for 60 days. No - There is not a plan to make this available Justification or reason for not sharing IPD is Due to the financial support of this research by the Ahvaz Jundishapur University of Medical Sciences , data of the study will be published after the end of the intervention as an article.