Vitamin E status of young women on combined-type oral contraceptives

Differences in vitamin E status between young Caucasian women using oral contraceptives (OCs) for 1 yr or more and control females were obtained with regard to the following parameters: 1) hemolysis, 2) plasma total tocopherols by spectrophotometric analysis, 3) individual tocopherols by a thin-layer gas-liquid chromatographic (TLC-GLC) technique, and 4) dietary intakes of vitamin E, polyunsaturated and saturated lipids, cholesterol and kilocalories. Ten subjects were on Ortho-Novum- or Norinyl-1/50, 8 on Ortho-Novum- or Norinyl-1/80, and 10 had never taken OCs. Analyses of 24-hr recalls and 7-day dietary records revealed no significant differences among groups for intakes of nutrients listed above. No significant differences among groups were observed from hemolytic values. Plasma total tocopherol concentrations measured by spectrophotometric and TLC-GLC techniques revealed that OC-1/80 subjects had significantly lower values than controls. Marginally inadequate vitamin E status as assessed by the various techniques was observed in approximately one subject in the control and OC-1/50 groups and in 2 of the OC-1/80 women. Large individual variations in vitamin E status were observed for subjects in all groups on similar estimated vitamin E intakes. TLC-GLC measurements of total tocopherols in plasma seemed to be perhaps a more sensitive indicator of vitamin E status of subjects than spectrophotometric analysis of tocopherols.