Juzzerbee - Giving a hive a pollen frame a couple months before spring will really get them motivated on building up brood. You could also use those frames while doing grafting in your Cell Starter colony. The bees need plenty of good pollen when they make queens. Or you could possibly sell those frames to people that are doing grafting or for their spring build ups.. There's no substitution for natural pollen when it comes to building up good bees. Sure the pollen sub will work, but the bees don't live very long either from what people say. I myself would feed those frames back to my bees in the late winter for spring build up.