Decided to try these, after reading the reviews. So glad I did! Have been treating my cats with Advocate for a while now, which was brilliant initially, but either the fleas or cats became resistant. Tried all sorts, sprays, shampoo etc but no success. Poor cats were scratching & cleaning constantly. This was like a magical, miracle cure. Within a week, no fleas at all!! They're are so much happier & calmer :) Amazing! Highly recommend!