A protein-rich nutritional food product composed of a probiotic and an edible isolated protein. The probiotic component may comprise Lactobacillus, Bacillus, Streptococcus Bifidobacteria, Saccharomyces or Leuconostoc. The isolated protein may comprise whey proteins, whey growth factor extract, glutamine peptide, egg albumen, soy proteins, or caseinates. This nutritional composition can be in the form of a food product, dietary supplement, or medical food which, upon ingestion, will promote a healthy intestinal microenvironment, provide a source of protein, and assist in the elimination of nitrogenous waste products that can build up in concentration in the circulating blood. Increased concentrations of the wastes are known to exert a negative impact on an individual's physiology and contribute to a decreased sense of well-being and general malaise. Methods for removing nitrogenous waste products from the blood and ameliorating renal failure using the nutritional product of the invention are also provided.
