PhD Nutrition L-Glutamine tablets provide 6000mg L-Glutamine per serving. Designed to support intense exercise, by providing muscle support and aiding muscle repair. Glutamine is an essential amino acid. It is also required by our muscles. It is one of the most vital building blocks in forming proteins. This can help with repair of muscle tissue and protein synthesis. Glutamine is an essential Amino Acid, required by your muscles. Therefore it is one of the most vital building blocks in forming the proteins.