I don't know about that but I use brewers yeast with garlic for my dogs and I haven't had a flea problem or fleas (for they are house dogs) in over 4 years and I don't use flea protection on them, I did at first until it got under control and now I haven't had a need
UKC CH Mystical Talyn D'Argo, TT, OFA H/E, CERF, AKC DNA
UKC CH Gretchen Julika Little Star, TT, OFA, Cerf, AKC DNA
Von Hornberger's Mystical Knight, TT, CERF, AKC DNA, OFA
Ranita's Heavenly Angel R.I.P 9/15/07-10/15/08
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