This study aimed to assess the effect of cumin soft gel on glycemic markers, lipid profile, and leptin in prediabetic subjects. In this rendomized controlled-placebo trial, patients will be enrolled if they were prediabetic according to American Diabetic Association, and who do not have other metabolic problems or who do not use drugs with interaction with cumin. ُAccording to previous studies, 25 subjects will be needed for each group but to avoid the loss, 32 subjects will be enrolled. After filling out the written consent form, patients were included in the study as 2 parallel groups. The intervention group will receive 75 mg cumin soft gel before the meal 3 times a day) while the placebo group will receive placebo (in the same shape and color). The intervention lunches for 10 weeks. Before and after the intervention, 10 cc blood will receive from each patient and biochemical assessments will perform. Glycemic markers (fasting blood sugar, glycosylated hemoglobin, insulin), lipid profile, and leptin will be measured for each patients.