Digestive - lower GI
The small and large intestine.
Herbal detox - parasites, colon cleanses, etc.
Archives: Best of the Herbal Forums: 03.2003.
Gut upset: quick tests.
Henriette's herbal blog: A few very fast allergy tests.
Food sensitivities.
Henriette's herbal blog: The problem is finding the offending food(s).