You can get charcoal tablets from Holland & Barrett, they are cheap, around £3. I buy the copper chlorophyllin in the form of Nullo. You can get these direct from Nullo website or sometimes cheaper from ebay. My doctor said it isn't a good idea to take them together as the charcoal will negate any effect nullo has so take them seperately.
I have been taking them both for a few months and have noticed a small difference but I think this is mainly down to cutting out eggs, nuts, cabbage, (TMAU diet). Plus I used to work in an air conditioned office which makes the smell much more noticeable, this was before I was diagnosed so cant really be certain.
I have decided to give Champex a go, and have been taking for 3 days now. Haven't really noticed a difference yet but will let you know.