Please start low, I recommend 50mg. Not too much. Since it works via enzymes and works like a vitamin that builds up overtime. I would say, slow titration every 2 weeks.
Listed in section 4
lot of over the counter options
bacaical skullcap is my favorite. Tincture from I iherb is pretty relaxing.
but lots and lots of options. Careful not to pick the (antagonists). I’m not sure of the modulator class either.
https://www.intechopen.com/chapters/78514