title: The effect of oral contraceptives on blood vitamin A levels and the role of sex hormones.
mesh_terms: D000328:Adult; D000818:Animals; D002338:Carotenoids / Q000378:metabolism; D003276:Contraceptives, Oral / Q000494:pharmacology*; D004967:Estrogens / Q000494:pharmacology*; D005260:Female; D006801:Humans; D012177:Retinol-Binding Proteins / Q000378:metabolism; D054839:Retinol-Binding Proteins, Plasma; D014801:Vitamin A / Q000378:metabolism*
chemical_list: D003276:Contraceptives, Oral; D004967:Estrogens; D012177:Retinol-Binding Proteins; D054839:Retinol-Binding Proteins, Plasma; D014801:Vitamin A; D002338:Carotenoids