My first introduction to valerian root was in a non-human vein. In country here, I occasionally encounter mouse issues. I live trap and drive the little beggars way to far to return! Makes for an overall mouse-free life.
Some mice like one trap over another. I find that it is efficient to keep three different trap types set in the most desirable food source area. Maybe hard to believe, but some mice become highly efficient at entering and exiting certain traps. That's why I use three types. Sooner or later ....

Then for the delightful drive in the country and introduction to the new landscape.

As long as it is not my place. Done.
So, one of the traps I use which is honestly one of the most effective in capturing mice, is the 'Mouse Inn'. Plastic construction which used to be of stronger construction when it first came out. They include pellets of valerian root to calm the trapped mouse. Not only have I never seen one of the many pellets touched by the mice, but the weaker/cheaper construction of the trap in recent times has actually allowed the trapped mice, given time, to rip the door right off its hinges!
So, although this trap works, I have to be prepared to drop this whole trap, while the mouse is still inside, into some containment that will last until the morning just in case they escape (which is predictable) ... so that I am not having to drive while just awakened from a sleep. I use an old roasting pan. Honestly, I have seen mice come and go from traps, moving food from one to another. I admit I do admire their ingenuity at times.
So valerian root. Mice don't seem to like it. But it must have some properties that are calming. You have a corporation that invests in its calming properties to keep mice from ripping its cheap doors off - doesn't work. It is also recommended for my pup's thunder storm anxiety.
My thoughts, it likely has some mild calming properties, on some more than others. And, hey, if it works, thank goodness ... calm is all too hard to come by.
