This works! I bought it to help calm the cats in the cattery at the RSPCA (on vet approval) where I volunteer, and it certainly has helped, especially with the more timid ones. This morning taking my 12 year old cat for a check up at the vets, I thought I’d try it on his bedding in the carrier. He was so much calmer, not shaking at all, even the vet commented on how calm he was and how his heart rate was excellent given the stress of being there. He was totally relaxed being weighed and checked. I thought he was going to fall asleep on the way home. Definitely recommend it.