Some cats will [also] be aggravated just by using a collar on and which will defeat the intent.” Substances Satchu says that pheromones, rosemary, chamomile, and tryptophan are a lot of the best substances to search for, although other solutions also contain calming aids like passionflower, colostrum, L-theanine, and jasmine. https://holdenjvzdf.shotblogs.com/a-secret-weapon-for-holistic-cat-health-treats-47377842