There is something good about these little treats but I am posetive what it is. All 3 of my dogs love them. They smell good. Do not leave a stink on my hands. They help their breathe and really help get "that musty" smell of my seniors breathe. Best of all they go bonkers when I take out a treat after dinner. They are a little tiny (about nickle diameter) for my big 50lb dogs but they like them so I make them happy by giving them.