Studies have shown that L-Glutamine supplementation can minimize breakdown of muscle and improve protein metabolism. 
 
Glutamine plays key roles in protein metabolism, cell volumizing, and anti-catabolism. Glutamine's anti-catabolism ability prevents the breakdown of your muscles.
 
This is especially useful for people "cutting down." Especially during summer when you're trying to get rid of some body fat without losing any muscle. Glutamine is needed throughout your body for optimal performance.