IRCT20100408003664N26 IRCT 2023-12-19 Tabriz University of Medical Sciences The effects of vitamin D supplementation on metabolic factors and obesity indices among omentin gene polymorphism genotypes in women with prediabetes The effects of vitamin D supplementation on metabolic factors and obesity indices among omentin gene polymorphism genotypes in women with prediabetes 2023-12-06 anticipated 48 Complete https://irct.ir/trial/74083 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Used, Assignment: Parallel, Purpose: Treatment, Randomization description: The eligible participants will be randomly allocated to intervention and placebo groups using software-generated random permuted blocks size of 4. The generated random sequence will be kept in a protected location and administered by an independent third party blind to the trial throughout the study. To hide, a random sequence will not be provided to the executor and will be performed sequentially for each block, Blinding description: The placebo and supplement will be packed in the same number in similar packages. The method of blindness will be that the supplements and placebo will be delivered to the participants by someone other than the researcher, and the researcher will remain unaware until the end of the study. 3 Prediabetes. Intervention 1: Intervention group: 50000 units once every two weeks vitamin D of Zahravi company for 3 month. Intervention 2: Control group: Intake a Placebo perl containing sunflower oil, which is similar to vitamin D supplement in terms of dosage, color and size, once every two weeks for 12 weeks. Undecided - It is not yet known if there will be a plan to make this available Justification or reason for indecision in sharing IPD is It is not yet known if there will be a plan to make this available