Source Naturals L-Glutamine, 500 mg, 100 TabletsSource Naturals LGlutamine, 500 mg, 100 Tablets, is a dietary supplement that provides LGlutamine, a freeform amino acid. LGlutamine can be converted into glutamic acid, which serves as an energy source for the brain and is a precursor to the neurotransmitter GABA (gammaaminobutyric acid). This product supports mental alertness and mood by facilitating the conversion of LGlutamine into glutamic acid, which cannot cross the bloodbrain barrier on its