Get the Real Thing
In recent years, we have seen an increased substitution of corn gluten feed and distillers grain for real corn gluten meal. This is often sold at feed stores or local garden stores. These products are not the real thing. They are not corn gluten meal and they will not work. They contain much less of the protein that contains the active component. The right product is the 60% protein material from wet milling. There are many wet millers around the world and they should be able to supply the 60% protein corn gluten meal.
For more information, see the official web site.