Corn gluten feed is that part of the commercial shelled corn that remains after the extraction of the larger portion of the starch, gluten, and germ by the processes employed in the wet milling manufacture of corn starch or syrup. (AAFCO, 2003) Corn gluten feed is commonly used in pet foods as a main protein source. Because corn gluten lacks or is low in critical essential amino acids such as lysine, methionine, arginine and taurine, it is not a good source of protein. (Natura.com) As with any corn product, it is considered highly allergenic for many pets, is a cheap filler ingredient and is not recommended.