Vitamins > Amino Acids

L-Glutamine 500 mg: 3017 Twinlab L-Glutamine is the most abundant amino acid found in muscle and plasma (accounting for more than 60% of the free amino acid pool in muscle cells). Many top sports nutrition researchers believe that L-Glutamine by Twinlab may be the single most important amino acid in the body for creating muscle tissue growth and protecting the body from overtraining.