I just checked that out and I think that statement is in reference to a German retrospective study. I believe kava is banned in Germany and they are very skeptical about it. But also further down it says this:
"Hawaiian researchers learned from a trader in Fijian kava that European
pharmaceutical companies eagerly bought up the stem and leaves peelings
when demand for kava extract soared in Europe in 2000 and 2001. Before
2002, substantial amounts of aerial parts of the kava plant were being
exported to North America and Europe and obviously used for the
production of commercial pill extracts. For traditional use in the South
Pacific, stem peelings and leaves are discarded, and only the rhizomes
are used and extracted with water. This may explain why native
populations that make heavy use of kava experience side effects that are
mild, temporary, and confined to the skin, whereas industrialized
countries that have newly adopted kava occasionally show severe, acute
responses."
I think the studies are really in a primitive state so far. But yeah, maybe it's a good idea to not indulge every day. I'd also like to feel a little more secure about this.
