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. 2008 Jan 11;74(5):1598–1612. doi: 10.1128/AEM.01508-07

TABLE 1.

pH values associated with the human GI tract

Site pHa
Stomach 1.5
Duodenum 6.0
Ileum 7.4
Cecum 5.7
Right colon 5.5
Mid-colon 5.5-6.5
Left colon 6.5
Rectum 6.7
a

Values were obtained from references 40 and 69.