My feeling on the whole thing is that to the greatest extent possible, food should be food and medicine should be medicine. Sometimes this isn't possible and prescription diets are necessary, but my opinion about z/d is that it should never, ever be used as a replacement for identifying and removing allergens from the diet.
Rice Protein Concentrate, Brewers Rice, Hydrolyzed Chicken Liver, Soybean Oil (preserved with BHA, propyl gallate and citric acid), Powdered Cellulose, Hydrolyzed Chicken, Calcium Carbonate, Potassium Chloride, Glyceryl Monostearate, Choline Chloride, Dicalcium Phosphate, vitamins (Vitamin E Supplement, L-Ascorbyl-2-Polyphosphate (source of vitamin C), Niacin, Thiamine Mononitrate, Vitamin A Supplement, Calcium Pantothenate, Riboflavin, Biotin, Vitamin B12 Supplement, Pyridoxine Hydrochloride, Folic Acid, Vitamin D3 Supplement,) Iodized Salt, Calcium Sulfate, Taurine, minerals (Ferrous Sulfate, Zinc Oxide, Copper Sulfate, Manganous Oxide, Calcium Iodate, Sodium Selenite), Ethoxyquin (a preservative), Beta-Carotene
Whatever this stuff is, it ain't food! Honestly, I cannot believe that proteins that are altered so the immune system cannot recognize them are going to be truly adequate for nutrition purposes.