The same bran we use for feeding our Rainbow Mealworms, Giants and Superworms.
We buy our bran from a mill used by bakeries, cereal companies, and for commercial baked goods. We pay more to have our grain not only finely ground but rolled so that each piece is easy for the small mealworm mouth to bite. We pay more for human quality grain, but we are so conciencious about avoiding pesticides and chemicals in our mealworms we don't mind.
Not only do we want to keep our mealworms as organic as possible, but did you know lots of people eat our mealworms?