S. EgoramaipholP. MigasenaV. SupawanMahidol University2018-10-122018-10-121985-01-01Journal of the Medical Association of Thailand. Vol.68, No.1 (1985), 19-23012522082-s2.0-0021797847https://repository.li.mahidol.ac.th/handle/20.500.14594/30872This study aimed to determine the effect of oral contraceptives (OCs) on thiamine status in 112 women aged 19-37 years. Subjects were divided into 2 groups by socioeconomic level (low and upper) and matched on the basis of social class to non-OC using controls. The duration of OC use in both experimental groups exceeded 6 months. Determinations of urinary thiamine excretion/gm creatinine were made. None of the study participants had thiamine deficiency. However, 15.2% of subjects in the lower socioeconomic OC group compared to 10.5% of women in the lower socioeconomic non-OC users group and 5.9% of subjects in the upper socioeconomic OC group compared to none of those in the upper socioeconomic non-OC users group had thiamine excretion values considered low (33-96 mcg/g). These findings tend to support the observation that OCs influence vitamin metabolism.Mahidol UniversityMedicineArticleSCOPUS