Where I am, there are high-dosed tablets, with 3-4 times the dose of the lower dose ones. I prefer the latter because taking five of them instead of the usual four is more viable than taking two of the stronger ones. Furthermore, I sometimes get away with taking three but always have the option of a fourth if three wasn't cutting it. More flexibility, quite simply.
The low dose tablets contain 150mg of a 5.3-6.6:1dried extract of valerian root, made using 45% w/w methanol. I suspect the variation in the proportion depends on the amount of soluble matter in each batch of valerian root. Unfortunately no comment is made on the valerenic acid content, but this could be part of the manufacturer's standardisation procedure.
When I've taken a higher than usual dose of this stuff, I've woken up in the night feeling surprisingly high, enough so that I couldn't feel annoyed at having my sleep disturbed. It took me a moment or two to work out what the hypnagogic state combined with physical and mental euphoria was all about (and to work out whether I'd be capable of standing up and walking to the bathroom).
I'm also uncertain of the contribution from my bedtime mixed herbal tea, which I've subsequently found to enhance cannabis.