L-Glutamine Powder 453.59gm 1 lb from Source NaturalsL Glutamine Free Form Capsules, Tablets and Powder L Glutamine can be converted to glutamic acid, which is both a precursor to the important inhibitory neurotransmitter GABA (gamma amino butyric acid) and an excitatory neurotransmitter in its own right. Athletes on high protein diets will appreciate the fact that glutamine transports ammonia, the toxic metabolic by product of protein breakdown, to the liver. There it is converted into less toxic urea