I have ben trying to get Milk Thistle into my cat as she has some chronic liver inflammation, but she won't eat Marin for cats (Nutramax labs chicken flavor chew) and she won't eat the straight powder from the health food store in her food or in a pill pocket. These treats, however, she gobbles up! I like the other ingredients in the formula too. For some reason this website doesn't list Milk Thistle as an ingredient, but the Vetriscience website does and the bag that I have states milk thistle among the ingredients. The treats are also grain-free so although they may contain a few things that are not 100% healthy in order to make them taste so good, it is a worthwhile tradeoff to get your cat to eat these supplements... and they don't cause my grain-sensitive cat (who otherwise eats a raw meat diet) any problems.