I feed mine on Hamster&gerbil food from oxbow. As far as I can see, the consist of almost the same ingredients, but the food for hamster got more fiber and fat then Regal Rat and got less calcium. The rat food also got L-ascorbyl-2-Monophosphate, Copper Sulfate(hamster got protenate). Since Im not an expert on nutrition I cant say if this is dangerous for hamsters. Maybe someone else here can answer?
