I do not think I have ever EVER purchased a "supplement" that my little dog didn't either spit out or spit up. That is, until I purchased these chewable wafers. AMAZING stuff!! She actually twirls around for these as soon as she sees the bottle. Weird. I mean, super crazy weird!! lol I don't know what is in this vs the other products we have tried, but she has never acted like this about any food -- other than maybe a piece of bacon (which she only gets on very very rare occasion). She is fed a 100% homemade diet for years and would turn her head away from any "dog treat" that any friends or the vet would offer. But she is absolutely bonkers about these chewable tablets.