Glutamine and creatine with your diet

I know this should be on the supps board but you guys could probably help as well.

I heard that if you take glutamine the same time you take your protein shake, its not good becuase they both compete for the same receptors. I also heard the same thing about creatine and glutamine, that you cant take those two together because they compete for the same receptors.

Are either one of these true? What happens if you take those together? Don't some creatines have glutamine in them? Don't alot of protein shakes have glutamine peptides in them?

I dont get it.

Also if you HAVE to take them seperatly, how long do you have to wait before you take one after the other (15 min, 45 min, 4 hours,???)