Many colon cleansers have strong stimulant laxatives in them such as senna, cascara sagrada, rhubarb root or cape aloe (Aloe ferox). They may also contain psyllium, which is sharp and can damage or irritate the intestines.  I don't think any of these should be used even in healthy people and especially not in cases of intestinal inflammation.

Soft fibers such as rice bran or oat bran would be safer and I recommend licorice root and yucca root for anti-inflammatories unless there are bleeding ulcers in which case the yucca root should be avoided.