L Glutamine Free Form Amino Acid from Solgar.
Solgar offers:
Guaranteed purity and potency of each amino acid. Pharmaceutical grade amino acids imported from the World's finest sources. Natural amino acids free from yeast, soy, dairy, eggs, wheat, corn, sugar, salt and starch.
In the brain, glutamine is a substrate for the production of both excitatory and inhibitory neurotransmitters (glutamate and gamma-aminobutyric acid, popularly known as GABA). Glutamine is also an important source of energy for the nervous system. If the brain is not receiving enough glucose, it compensates by increasing glutamine metabolism for energy. Glutamine users often report more energy, less fatigue and better mood.