I've tried it in capsule form and noticed some effects. I posted on the kava subreddit but it got taken down because apparently this is not real kava which was kinda... odd. I mean it is, it's just not as potent as the liquid forms or whatever people take. I was interested in buying some extract or something online to see what feeling it could really give. I've noticed subtle calming but that's about it. I used to have Gaia Herbs caps with 75% kavalctones but the stuff I have now is only 30%, with 100mg ginseng each capsule. Not sure what the ginseng is supposed to achieve exactly. The Gaia Herbs one was like liquid Kava in capsules though so I think that was closer to the real thing than the root I'm taking. It certainly tasted pretty bad. A lot of people talk fondly of kava and yet a lot of people say it's very subtle and you have to not really look for a feeling to actually feel it. others describe getting "krunk" and I've heard all this talk of reverse tolerance but I think that's a myth honestly.
It's not odd, they are right it's not real kava in the sense that the effects of most extracts are nothing like the feeling of real kava prepared in the traditional manner. If you want to actually feel the high or "krunk" kava can provide, you need to try a potent kava prepared in the traditional manner (or using the blender method which I've heard is even more potent). Reverse tolerance is a thing but now it is being called "initial resistance" which is more accurate.
The effects of kava can be strong too. If you drink a whole bunch of potent kava at once you can even get a kava rush, which is intense and very pleasurable. I used to enjoy a kava rush as much if not more than the rush from heroin IVed. The difference is, kava is very hit or miss. With IV heroin, the rush is almost always very pleasurable whereas with kava sometimes it hits you right and you get incredible euphoria, other times you can take the same dose in the same situation and barely feel anything.