Sorry gunnz, what I meant to say was L-Glutamine and Creatine compete for absorbtion. It would be much better to use glutamine peptides if you mix the two. Here's part of an article backing up that statement. I made the main point stand out.
GLUTAMINE
The muscle power of Glutamine is etched in stone. This amino acid, the most abundant in muscle tissue (over 50% of the total amino acid pool), is a powerful anabolic and anticatabolic. Glutamine boosts anabolism by helping maintain protein balance and increasing protein synthesis while putting the brakes on protein degradation. It increases testosterone secretion and its anticatabolic activity decreases muscle breakdown during metabolic acidosis. This is a catabolic condition common to overtrained athletes or those on excessively high protein diets supplemented with inefficient sources, (e.g. whey-only protein powders).
In one study, glutamine supplementation was even demonstrated to prevent glucocorticoid- (dexamethasone-) induced muscle atrophy, illustrating that this amino acid is a worthwhile addition to the arsenal of any athlete intending to give cortisol a serious ass kicking!
Glutamine concentrations and synthesis are decreased by illness, high intensity exercise and, believe it or not, the use of growth hormone. Under some catabolic conditions, glutamine levels drop by as much as 50%. To make matters worse, it's also largely utilized by the gut and snapped up by the liver for glucose formation (gluconeogenesis).
Timing and source are important too. The few negative studies that found little influence of supplemental glutamine on skeletal muscle levels studied only L-glutamine. Other studies have indicated that peptide-bonded glutamine has higher bioavailability than its free-form counterpart; therefore it makes good sense to use only this form in any glutamine/creatine combination, particularly with creatine and L-glutamine absorption mixing.