Hi Matt welcome to the forum!
Have you tried Feliway diffusers or sprays? In case you don't already know they release a scent into the air (that is only detected by your cats & not you) The scent replicates the smell of feline facial pherimones which help to put your cat at ease. I have heard of many great results from using Feliway.
You can buy herbal remedies in some pet stores but I have no idea how good they are.
Angelkiss x
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