U.S. Department of Health and Human Services


Lactose Intolerance

Lactose Intolerance

Frequently asked questions about lactose intolerance, the inability to digest significant amounts of lactose, the predominant sugar of milk.

Review Date: April 03, 2015

NIH National Institute of Diabetes and Digestive and Kidney Diseases - NIDDK

Note: Documents in PDF format require the Adobe Acrobat Reader®. If you experience problems with PDF documents, please download the latest version of the Reader®.