This works! Was skeptic and wondered if this cheaper version of the one beginning with F would have an effect, within one day we had much more relaxed cats, over time confidence and friendliness was improved too. Can’t believe the price and highly recommend it. We have 2 part feral, extremely nervy house cats,brother&sister,brother sometimes trouble with rough play and ‘aggressively amorous’ even though both spayed, lots of hiding, nervous cleaning and skittish beyond belief. Both scared of everything from the doorbell to turning a page in a book or zips being done up. It doesn’t completely cure them, which we can appreciate as they weren’t socialised as kittens and had a bad start, but it does appear to provide a sort of invisible comfort blanket and dial down their troubles.