Yes, I've heard of it but haven't taken it for any length of time. An osteopath, who seemed pretty up to speed with supplements, told me to try building up to a 9 gram a day regimen--not a cheap undertaking as most capsule forms are .5-1gram a piece. I know there are powder forms, however, I haven't found any cost effective brands just yet.
He also advised me to take it without food as it supposedly competes with other nutrients for absorption. I haven't really surfed around looking for opinions on dosaging; maybe something like 5 grams would be sufficient for gut healing purposes?