Inorganic iron can be used to build hemoglobin (Stockman, 1893).
Ahrens
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Department of Nutrition and Food Science, College of Agriculture and Natural Resources, University of Maryland, College Park 20742-7521, USA.
D000740:Anemia / Q000097:blood / Q000266:history; D005260:Female; D006454:Hemoglobins / Q000096:biosynthesis*; D049669:History, 16th Century; D049670:History, 17th Century; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D007501:Iron / Q000008:administration & dosage / Q000378:metabolism* / Q000627:therapeutic use; D008598:Menstruation
D006454:Hemoglobins; D007501:Iron