No, the types of vegetable proteins used are stated: rice, potato, corn and wheat.
One must be careful of how the term byproduct is construed and used when speaking about health and nutrition. While a byproduct has historically been the least nutritional of the fractions derived from a food, in modern times the opposite has become true. Many byproducts of the human food industry are, in fact, the most nutritious. That’s because people prefer white refined substances such as white sugar, white starch, white salt, white meat, and white fats. To do this, processors must separate the white part from everything else. The "everything else" is then called "byproduct."
So "byproduct" has wrongfully become a word taken in the pejorative -- as akin to garbage, something suited for a land fill or toxic waste dump. In many instances, however, a byproduct is something of great nutritional value.
A good example is the milling of rice to get white rice. The "byproduct" bran contains all the more important nutrients such as essential fatty acids, minerals, antioxidants, and vitamins such as thiamin. Thousands around the globe have suffered and died from both overt and idiopathic/pleomorphic beri beri (thiamin deficiency) as a result of casting aside the bran "byproduct" that is then used in animal feed. The animals thrive, the humans suffer and die. (Not to mention the degenerative diseases that result over time from eating the high glycemic, nutrient denuded white rice starch.)
Vegetable proteins are the prizes to be mined from potato, rice, corn, etc.
The starches are the inferior byproducts. This is exactly opposite to prevailing pet food mythology. When proteins, be they glutens or others, are separated from the starches in grains, the starches are the true byproducts.
The proprietary protein mix used in Epigen™ consists of the most nutritious parts of the grains and tubers from which they are derived. The starch byproducts are absent.
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