Letter: Oral contraceptives and vitamin nutrition.
D001205:Ascorbic Acid / Q000097:blood; D003276:Contraceptives, Oral / Q000009:adverse effects*; D003906:Developing Countries; D004032:Diet; D005260:Female; D006801:Humans; D008525:Medroxyprogesterone / Q000009:adverse effects*; D011732:Pyridoxal Phosphate / Q000097:blood; D012256:Riboflavin / Q000097:blood; D014801:Vitamin A / Q000097:blood; D014805:Vitamin B 12 / Q000097:blood; D014810:Vitamin E / Q000097:blood; D014815:Vitamins / Q000097:blood*
D003276:Contraceptives, Oral; D014815:Vitamins; D014801:Vitamin A; D014810:Vitamin E; D011732:Pyridoxal Phosphate; D008525:Medroxyprogesterone; D014805:Vitamin B 12; D001205:Ascorbic Acid; D012256:Riboflavin