title: Lack of significant effect of vitamin E on porphyrin metabolism. Report of four patients with various forms of porphyria.
mesh_terms: D000328:Adult; D005243:Feces / Q000032:analysis; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011164:Porphyrias / Q000097:blood / Q000188:drug therapy* / Q000378:metabolism; D011166:Porphyrins / Q000097:blood / Q000378:metabolism* / Q000652:urine; D014810:Vitamin E / Q000008:administration & dosage / Q000097:blood / Q000378:metabolism / Q000627:therapeutic use*
chemical_list: D011166:Porphyrins; D014810:Vitamin E