I bought this off of someone's recommendation on this forum. I had recently gotten a new cat and my resident cat was growling, hissing, chasing, etc. The smell is a little milky. Neither of my cats ate it when I put it in their food. I tried syringing it but my cat struggled so much and the amount I needed to get into her was so much that it made it unrealistic to do everyday. After about a month, it started to smell off! It smelled like sour dairy. I had hardly used it at all, and was very disappointed. The instructions did not say to keep it in the refrigerator or anything. I also checked reviews on Amazon and apparently it goes bad for other people too. I didn't see any changes in behavior either. I know a lot of people swear by this, but for us personally, it wasn't a good fit.