i also use l-glutamine to repair my leaky gut and relax my ibs, but i do it slightly different than everyone else seems to recommend on ibs forums.
i mix my plain l-glutamine powder in a whey protein shake, this way it seems to balance out the glutamine with other amino acids.
i get the plain whey protein powder, basically it is just a protein powder (amino acids), l-glutamine is a amino acid, so i find it balances it out somewhat, i got onto this combo because i use it to recover from my bodybuilding training, but found it also helps the leaky gut and ibs. http://www.bodybuildingforumuk.com/viewtopic.php?f=8&t=1168&sid=e9e95860bc64a...