Colonoscopy Revealed Darkened Colon
Some Doctors comment on darkened colon walls and advise to stop herbs.
Here is what I recommend:
When you are going to have a colonoscopy you will want to stop taking Jim's (or any other herbal remedy) 3 weeks prior to your procedure.
The darkening does not effect the function of your colon, but doctors would prefer you to be constipated or taking a pharmaceutical solution since they do not have any training in herbal remedy.