Glutamine 

L-glutamine is an amino acid necessary to keep the body in the right condition, it is an important fuel for the brain. It improves the ability to concentrate and supports memory processes, increases the level of body regeneration. It effectively increases immunity as well as plays a key role in nitrogen metabolism. L-glutamine plays an important role for people practicing long-distance running, helping to cleanse the body of harmful products of metabolism and by supporting the immune system. Supplementation with L-glutamine guarantees faster regeneration after training, which significantly increases strength and helps repair skeletal muscles.