The duodenum is the first part of the small intestine. It is located between the stomach and the middle part of the small intestine, or jejunum.
The absorption of vitamins, minerals, and other nutrients begins in the duodenum.
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Reviewed By: Linda J. Vorvick, MD, Clinical Associate Professor, Department of Family Medicine, UW Medicine, School of Medicine, University of Washington, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.