American College of Gastroenterology

American Gastroenterological Association

American Liver Foundation 

American Society for Gastrointestinal Endoscopy

C. Everett Koop

Centers for Disease Control and Prevention

Crohn’s and Colitis Foundation of America

Food and Drug Administration

Gut Feelings

Health A to Z 

HealthAnswers.com

Healthfinder: US government site with links to legitimate sources of information (reviewed)

Helicobacter Foundation 

Hepatitis Resource Center

Med Help International 

MedicineNet

National Institute of Diabetes & Digestive and Kidney Diseases 

Pediatric/Adolescent Gastroesophageal Reflux Association

Preferred Hospitals