Yea,
Back in the day when Kava Kava was still legal in Canada I had tried out the pharmacy bottle/s of Kava Kava in large doses which all they ever did was just numb my mouth like coke but never anything else and I didnt even smoke weed back then so I would have felt it if something was there.
I gave up on Kava Kava esp since I heard reports of irreversible liver damage (Germany banned it same time Canada did..early in 2000 sometime maybe 01-02).
I tried Valerian which came in doses of 500mg with nothing else, the bottle said to take 3 or 4-5 a day at the most. I took 2 tablets at once during recess and while walking I felt a sense of calm that I felt only from opioids before, at that time if I took a benzo it felt disgusting turning me into a zombie and regreting it. I took another 2 tablets after 30-40min from the 1st dose and I was able to nod out slightly and I was definatley much calmer during that day.
The thing is the 1st time always works the best and after a while you build a tolerence even if you mix it with weed and alcohol it will not feel the same. You just need a break/s.
Valerian however is not a dangerous herb and in moderate doses even helps aid the liver!
Peace!