Disclosed herein is Brunner's Gland Stem/Progenitor Cells (BGSCs) having phenotypic traits of endodermal stem cells and positive for pluripotency markers, and methods of isolating them from the human duodenum. Moreover, the present disclosure provides that BGSCs are easily isolated from duodenum from human donors, can be expanded in culture or induced to differentiate towards hepatic and pancreatic lineages and could represent a cell source for clinical programs of regenerative medicine.