title: Effect of oral contraceptives on vitamin-B12 metabolism.
mesh_terms: D003276:Contraceptives, Oral / Q000009:adverse effects*; D005260:Female; D005492:Folic Acid / Q000097:blood; D006801:Humans; D011247:Pregnancy; D014805:Vitamin B 12 / Q000097:blood / Q000378:metabolism*
chemical_list: D003276:Contraceptives, Oral; D005492:Folic Acid; D014805:Vitamin B 12