Glutamine Comfort Powder, Value Size, 8 oz, Source NaturalsSource Naturals Glutamine Comfort Dietary Supplement. Supports Healthy GI Lining & Permeability. Source Naturals Glutamine Comfort supports a healthy gut barrier by providing nourishment for the mucosal cells that form the gastrointestinal lining and are responsible for healthy permeability. Preliminary research has shown that glutamine and deglycyrrhizinated licorice (DGL) may support healthy intestinal mucosa. And, preliminary in vitro research on