If you look on amazon, or google, there is quite a bit of good feedback. I don't know whether it's useful for UC, but it can probably be useful for general stomach and intestinal ailments. I would try it if I were suffering with stomach upset. Probably can't hurt.
/en.wikipedia.org/wiki/Activated_charcoal_(medication) It's actually used for treating poisoning
Somebody said...
Activated charcoal, also known as activated carbon, is a medication used to treat poisonings that occurred by mouth. To be effective it must be used within a short time of the poisoning occurring, typically an hour. It does not work for poisonings by cyanide, corrosive agents, iron, lithium, alcohols, or malathion. It may be taken by mouth or given by a nasogastric tube. Other uses include inside hemoperfusion machines.
Common side effects include vomiting, black stools, diarrhea, and constipation. The more serious side effect, pneumonitis, may result if aspirated into the lungs.Use in pregnancy and breastfeeding is safe. Activated charcoal works by adsorbing the toxin.