Ok, so I received the CO2 extract from Paradise Kava yesterday and tried some this morning on an empty stomach.
I got a sampler size of the Honey Lemon; 10g of extract. The container is pretty tiny. It has a distinctive smell and tastes a little bitter. It's by no means delicious, but manageable. I suspect that the Chocolate Orange flavor tastes better, since that's the one people seem to talk about.
The website says to take a pea-sized portion, approximately 1g, apply sublingually (underneath the tongue), and let it dissolve. I don't have tools to measure it with, so I just put a little bit on the tip of a spoon and stuck it underneath my tongue. Waited for about five minutes with no effect. Took another serving and waited for another five minutes. There was still no effect that I could discern, so I took one more serving and left it at that. I was just sitting at home because I wanted to do a preliminary test to know how it affected me before I try going out and about.
So I'm left with no effect, at least for now. I've read there is a sort of reverse-tolerance to Kava, so I'll try it again tomorrow. I'm also going out this weekend to a performance with my parents, so that would be an excellent time to give it a more intense stress test.
I don't know if my history with medications would affect my tolerance, but I was on Effexor (Venlafaxine) and Klonopin (Clonazepam) for five years, until the middle of last year when I finished tapering off.
The website recommends no more than 250mg of kavalactones a day (which is two servings, or 2g, of this particular extract), which is based on a study that used the same dosage safely with patients.
Leave your doctor a note before trying any psychoactive herbal supplements. Don't drive until you know how they affect you.
I hope this helps, and I'll post the results of more tests in a few days.