Rocky has allergies really bad and we have him on lamb and rice diet wich helps but he also is on benedryl two pills per day and also get sprayed with hydrocortisone spray when needed but we still have our days with breakouts he has actually gotten his hair back with addition of benedryl but my question is who here uses brewers yeast and what is your opinion on it it was suggested to me to use as an allergian reducer and to keep flys, fleas, and mosquitos away does it work and how safe is it?? I am a vet tech and the vet I work with does not recommend it but I am a firm believer that you go by what you think is best vets are like MD's and you need to use some of your own knowledge too