Gastrointestinal tract diagnostics using the GI EFFECT Comprehensive Stool Profile (Genova Diagnostics). The test assesses the intestinal microbiota, the integrity and condition of the intestinal mucosa (zonulin level test - additional fee), parameters of inflammation of the mucosa, the function of the immune system, the processes of digestion and absorption of substances, the need for support of the gastrointestinal tract with pro and prebiotics, and potential bacterial infections, fungal or parasitic.