Letter: Vitamins and oral contraceptives.
D000328:Adult; D001205:Ascorbic Acid / Q000008:administration & dosage / Q000097:blood; D001206:Ascorbic Acid Deficiency / Q000139:chemically induced*; D003276:Contraceptives, Oral / Q000009:adverse effects*; D005260:Female; D006801:Humans
D003276:Contraceptives, Oral; D001205:Ascorbic Acid