Here's a little something I found that might help answer some recent questions:
What is Glutamine supposed to do?
Glutamine regulates protein synthesis, along with inhibiting protein degradation and stimulating glycogen synthesis. Due to these effects, glutamine plays an important part in your body by aiding recovery of muscle calls. Intense weight training (inducing a catabolic state) has been shown to uniformly decrease glutamine levels by 50%, taking several hours to return to normal levels. In athletes, glutamine has been used as a marker to overtraining. In this condition research shows glutamine levels are significantly reduced, taking up to one month to return to baseline. These athletes have increased susceptibility to infection, resulting from impaired immune functions. For these reasons, athletes have been supplementing their diet with significant amounts of glutamine. In addition, glutamine has an important cell volumizing effect, which is to trigger a growth promoting effect. Glutamine is also a nitrogen transporter, helps in the correction of acidosis, preserves blood pH, and stimulates the immune system.