I have no scientific studies to back up bee pollen but I do have two particular stories that say it can do wonders. A friend of mine had horrible allergies every pollen season. I mean migraine headaches, sinus pressure, stuffiness. I mean bad enough to miss work. An older guy who keeps bees gave him a natural cure. Sprinkle locally made bee pollen on your salad or whatever two to three times a week and eat one tablespoon of locally made/locally gathered honey per day. Within a week his allergy issues were gone. That has been over four years ago and he has yet to have an allergy related sniffle. My wife does the same thing and she no longer suffers with seasonal allergies.
With the dogs. I had an older bitch that had a heat cycle around 8 months and again at 20 months and then never again. I did not spend the money on a specialist but the bloodwork and vet exam said she was healthy. I waited. And I waited. Same old guy told me to add the bee pollen to her diet, as much as she would eat. I did and within two weeks she was bleeding. Coincidence? Maybe. I waited from her 20 month mark til she was 7 years old and two weeks after bee polled she was in heat. EWO