IRCT20160822029472N3 IRCT 2026-05-11 Shahid Beheshti University of Medical Sciences Effect of quince fruit extract and apple cider vinegar on glycemic indices Determining the effect of quince fruit extract and apple cider vinegar on glycemic indices in adults with prediabetes: A double blind randomized clinical trial 2026-06-22 anticipated 108 Pending https://irct.ir/trial/83669 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Used, Assignment: Single, Purpose: Treatment, Randomization description: The design of this study is perfumed block randomization, in which the participants are allocated to intervention and control groups using the Block Randomization method in 18 blocks (in 3 groups) with a Block size of 6. In this study, which will be conducted for 12 weeks, patients with prediabetes will be randomly divided into 3 groups (2 intervention groups and 1 control group). In the first group, it is recommended to consume one tablespoon of apple cider vinegar with a glass of water during each meal (breakfast, lunch, and dinner). In the second group, it is recommended to consume one tablespoon of fruit juice during each meal (breakfast, lunch, and dinner). In the third group, the control group receives nothing. In this study, the principal investigator will not be involved in the randomization process, Blinding description: In this study, blinding will be done for patients and researchers, and a person outside the research team will be selected to evaluate the results. Randomization will be done by a third person. In this way, patients and study researchers are not aware of the type of groups and the double-blind conditions of the study are maintained. Apple cider vinegar and fruit will be packaged and shipped in such a way that the difference between the two cannot be easily identified. At the end of the study, after the results are determined, the labels will be revealed by a third person and the information will be evaluated. 3 Prediabetes. Intervention 1: Intervention group: Recommended to consume one tablespoon (5 ml) of apple cider vinegar with a glass of water during each meal (breakfast, lunch, and dinner). Intervention 2: Intervention group: In the second group, it is recommended to consume one tablespoon of fruit extract (5 ml) during each meal (breakfast, lunch, and dinner). Intervention 3: Control group: They don't receive anything. No - There is not a plan to make this available Justification or reason for not sharing IPD is No further information available.