A ninety two year old friend of mine said her doctor told her to take it many many years ago. Any sign of the flu or intestinal distress-gas bloating-she takes it. I gave some to my niece who just at a store and called me and said she was coming down with food poisoning. I told her to come over and she took about 8 capsules, was feeling horrible but 15 minutes later she could tell she was getting over it. I gave her some to take home incase she needed some later. My doctors book said no medicine cabinet should be without it. Also my husband had gotten bitten by a poisonous spider and he started getting a bad rash that spread to his back. We went to an accupuncturist. She gave him a few treatments and some horrible smelling tea to drink every night for 5 days. But it still seemed like he was healing so slowly. So he started taking charcoal tabs and seemed to heal up alot faster.
This website is good at explaining what it does and how much some take. I don't like to take too much of anything as I think balance is always good and don't fix it if it ain't broke. So moderation is the key. But the body has away of letting you know how much is too much IMO.