I usually take in about 36 grams of glutamine a day. I was reading somewhere that more than 15grams is a waste. I don't take glutamine by itself, it's in my protein mix. I use Optimum Protein that has 4 grams of glutamic acid/glutamine and 22 grams of protein per serving. I usually drink about 9 servings a day, hence the 36 grams. That isn't too much is it. I higly reccomend this stuff, it also has a boat load of amino acids in it as well. Arginine, Lysine, Phenylalanine, etc......