Liz,
I'm not a doctor, but I take exactly what you described in your post (the only thing I do differently is I take the 200mg of Chromium 45 minutes before Lunch and Dinnter; you do it before breakfast and lunch) and I haven't had any ill effects at all from taking the Chromium and L-Glutimine together.

I don't remember the page in DANDR, but he says we can take the amounts you specified and can take them together.

Don't know if I helped, but know that I am doing the exact same thing as you and I've been doing it for about a week now. And I've noticed weight loss with it. Again, don't know if it's because of the Chromium and L-Glutimine, but since I don't appear to have any side effects from taking them together, I'm going to continue.

Again, hope I helped