L-Glutamine is an amino acid and over the last five years it has become a very popular supplement to take L-Glutamine makes up 60% of the total amino acids found in muscles, it is best known for its immune System support, which is very important for muscle growth.
People who have used L-glutamine have reported good results using 10–15 grams a day. An important note about glutamine is, when the body is stressed through training, glutamine leaves the muscles and is sent into the blood to support the immune system, if there is a lack of glutamine the immune system becomes weak and muscle growth cannot occur.