HAMP and celiac disease: -Reassess dose, formulation, administration timing, dietary inhibitors-Check: hepcidin, Ret-He, inflammation markers-Investigate malabsorption: celiac disease serology, Helicobacter pylori research in stool-Investigate blood loss: occult blood in stool, EGD- and/or RC-scopy, capsule endoscopy if needed-Consider IV iron if oral therapy fails