Hi I am going to add my 2 cents worth on the subject of pollen substitute, brewer's yeast, soy flour and Bee-Pro. Here at Kona Queen we feed pollen subsitute on a massive scale. The last four months of the year are very dry and oftentimes pollen sources disappear. Since we are in permanent locations, we cannot move to the other side of the island and find a flow, so we use "pollen patties" to boost the colonies. Our experience has been that soy flour will turn hard. Like cement! Now this may be due to the humidity in our tropical climate, and you might not have this problem elsewhere. A strong colony will use the pollen pattie before it turns hard, but then we are not too interested in feeding the strong colony! Two years ago we bought a container load of Bee-Pro. We thought it would eliminate the need to import pollen and save us the time of mixing the ingredients. Unfortunately, it must contain soy flour, as it turned hard. I still have half a container load left! We now order brewer's yeast by the container load from California Spray Dry. We mix it with pollen, and sugar syrup and put it in wax paper bags. The "patty" weighs a pound and a half. This goes directly on top of the brood nest. Results are astounding. If you would like a more exact recipe, I can provide it. Mark at Kona Queen