Shelly, Pam Grant is probably a better bet to give you all the details, but I know that BY has a high concentration of B vitamins. Also, the garlic repels fleas (notice how I didn't say "eliminate"?). All I know is that it's good for them and my ferrets have never had nicer coats. And our flea infestations have been cut in half or more! Amy & Dave (and their gaggle of giggling ferrets) RIP Ian and Elektra [Posted in FML issue 1615]