The present invention provides probiotic compositions for consumption by both animals and humans for augmenting kidney function. The probiotic compositions are efficacious in removing toxic nitrogenous by-products and inhibiting the overgrowth of undesirable bacteria. The compositions of the present invention are also useful for restoring or maintaining gastrointestinal health and delaying the onset of illness in patients with metabolic syndromes such as borderline diabetics or hypertension.