This amino acid is the most abundant in blood plasma, helps in protein metabolism, and is necessary for growth and repair of damaged tissues. After a grueling workout, your body may need more of it than you think. Ours provides you with 4.6 grams of this valuable supplement. Research shows that after intensely working out, glutamine levels in the body are reduced by as much as 50%. Since the body relies on glutamine as cellular fuel for the immune system, scientific studies have shown that glutamine supplementation can minimize the breakdown of muscle tissue and improve protein metabolism.