Some cats will [also] be aggravated just by using a collar on and which will defeat the goal.” Elements Satchu suggests that pheromones, rosemary, chamomile, and tryptophan are a number of the major ingredients to search for, although other items also comprise calming aids like passionflower, colostrum, L-theanine, and jasmine. https://charliemwdin.bloggazzo.com/32380070/calming-pet-chews-secrets