Nitro Strength muscle building. Information is going to make a big difference in the amount of time that it takes you to reach your goals.Glutamine is 1 of 11 nonessential amino acids. Just because it's nonessential doesn't mean it's not necessary. Simply put, the body can produce what it needs. 60% of all free form amino acids come in the form of glutamine. During times of stress (stress not defined), glutamine reserves are depleted.