If there is any confusion with other yeasts, Brewer's yeast doesn't cause the type of excessive gas production that yeast used in bread recipes does. Bread yeast found in raw dough can make dogs very sick if they eat too much of it.
According to Tuft's veterinary nutrition service, "The most commonly reported food allergies in dogs and cats are chicken, beef, dairy, and egg (and fish for cats). There is nothing particularly special about these ingredients other than they have been the most common ingredients in pet foods for the past few decades, so both cats and dogs often have been exposed to them a lot. What surprises many pet owners is that grains are actually uncommon causes of food allergies – most pets are allergic to animal proteins!"
"MYTH: Brewers yeast in the diet will cause a yeast infection in the skin.
FACT: Brewer’s yeast will NOT influence Malassezia [skin yeast] overgrowth.
Brewer’s yeast is Saccharomyces cerevisiae and is considered a source of vitamin B, selenium, and chromium. There is one 2006 study in the human literature that showed patients demonstrated an INCREASE in salivary gland IgA levels after oral administration. Although this study is not in animals and is quite limited, it would appear to contradict the myth. It is doubtful that Brewer’s yeast would be either beneficial OR harmful for yeast dermatitis patients."
I hope this information helps clear up some of the confusion about Brewer's yeast.
All the best,
Dr. Lorelei Wakefield, VMD

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