Bought some of this, root powder, from globalkavaexports (decent vendor).
First night tried 2 tablespoons, extraction in water using muslin, filtered etc. Some effects similar to alcohol. Felt nausea a couple of hours after taking, woke up with mild hangover.
Last night, tried 4 tablespoons, same extraction method. Couple of hours later, extreme nausea. Had the worst hangover of my life today with depressed mood, irritability, nausea, fatigue.
Won't be touching the rest of this. My experience of the substance seems like a less effective alcohol with a worse hangover.
Decent as an appetite suppressant though, but probably just because it induces nausea.