Valerian root powder, fluid or tincture will stimulate a cats interest with sometimes hilarious results. It will also cause rubbing on the material as do other ingredients. Does it have a calming effect over time? It may very well depending on the concentration amount and the exposure time to the material.
I am not concerned with the long term affect when exposed to the material, only that it promotes some interest and it gets a response from the animal.
If an animal is curious it can be caught if it spends that much time investigating. It is a natural occurring material and not a drug. That is what a trapper wants in a product. Something that instills interest and appeals to their basic nature of who and how they react instinctively.
I have long used and tested Valerian in various forms with good success. Built into a formula it works and its even better with other ingredients. It makes for a very effective product. Each has and is entitled to their own opinion and their findings.
I can only state in my many years of experience it has proven to be a valuable individual ingredient as well as a blended ingredient. I have tested all the ingredients that we have in inventory. I have in the past and we will continue to use them to this day. If there is minimal or very little interest in an ingredient then it has no value for my use or to purchase or the interest for making tinctured agents or other components from it for future use.
I would suggest testing some material on local felines or setting up a trail cam or two on some applied monitoring sites to form your own opinion. I will continue to use the material as I have for many years in our formulas that call for its use. I will also continue to test and search out any ingredients or materials that prove to give me and my customers the edge while in the field. Research & Development is a big part of what we do here as well it should be.
You cannot be a progressive on the cutting edge of formulation work and fail to continue to work towards continued advancement in the performance in your products.
Bobbie sleeps with them cats, hhhheeeeyyy wheres the valerian I GOTTA GET MORE SLEEP, Ahhhhh thank you ..

This is America , I still believe, even though there is a barnyard going on in D.C.so the freedom of anyone person opinion still is American !
I agree with Mike Marsyada he was there back yonder picking Mr. Nick's brain, before the Good 'Ole Days came, ingredients were gloriously Good Quality, Good 'Ole Nick! God Bless him .
One can figure that someone over and over told them that , and over time, time, time, anybody would believe that , No matter what it is concerning , what worked then may not work,
most EVERYTHING in animal attractors today , Will Never be the Great Quality it once was, valerian is not the same valerian as it it once was . Same name, same officialis , No,
there was a day back when valerian was a great stout useful material . Even castor from beaver are different, pollution , poisons, and ALL , same, No .
advent of big farming big box stores big GM that fell down , America is NOT the same, and neither is valerian .
The earths soil has changed, over and over , and millions buried in it or in the wind that blew there precious ashes into it . Sure people died before, but there was not ALL these artificials , same NOT .
Most everything is artificial today, and getting worst , in some form or another and the material used that whacked at the old world valerian to cause it to become liquid is artificial and not really for it's purpose .
Is valerian , really, valerian , today, NO, it's something , IMHO