didnt do a darn thing for my dogs or my dads.. we tried for flea prevention, itchy skin, eye boogers.. etc.. it didnt help with fleas AT ALL, tried putting it in thier water/food.. (not at the same time of course) didnt see any improvement in eye boogers, dry skin etc, and it made my dogs skin problems worse so I chalked it up as I tried it, didnt work.. moved onto something else.
Hope it works for you !!