They answered:
"No, Vanuatu Blend kava is not harmful. We source our Kava from the islands of Vanuatu which is known to have some of the best kava in the world. The Vanuatu blend is made with noble kava that has been independently tested using HPLC analysis, DNA bar-coding and organically bio managed for quality and safety purposes. None of our kava products are extracts, made with stems or leaves or wild kava (Piper witschmanii)
We do sell a 100% lateral root product as well. Usually people will feel more of a heady feel when using the lateral root compared to the Vanuatu Blend which gives more of a balanced body to heady feel.
I would like to offer a little clarification regarding the definitions of noble kava vs tudai kava. The fundamental basis of classifying a kava variety as good (noble) or bad (tudai) is the cultivar of the kava. Botanically/Agriculturally speaking, a cultivar is just a formal variety that is unique and distinct from other varieties (macintosh, granny smith, and golden delicious are all different apple cultivars, for instance). The government of Vanuatu has designated specific kava cultivars as being good, and these are called noble, and everything else is by default not noble. The Vanuatu gov't has classified 28 varieties as "noble" (recommended for daily consumption, 79 varieties as "medicinal" (good for drinking but not preferred), 126 varieties as "tudai" (safe but not recommended because may be unpleasant), and 12 as Piper witschmanii (wild kava, not safe for human consumption). The government of Vanuatu only promotes export of approved, noble, varieties. Tudai is a local Vanuatu word that has gained some wider popularity in recent years. The origin of the term tudai came from kava from a specific group of villages that people found to be too harsh and sort of nauseating, but now it is commonly used to talk about all kava that does not fit the Vanuatu governments definition of noble. There are plenty of other varieties of kava that are neither noble nor tudei, that have a wide variety of kavalactone profiles.
The numbering system, of classifying the chemotypes of kava is related to Noble-vs-Tudai classification, but they are not synonymous. In post-hoc studies it was found that all noble varieties consistently have one of a few different kavalactone profiles, while "inferior" cultivars of kava shared a different group of kavalactone profiles. So the kavalactone profile relates to noble classification, but there are multiple different kavalactone profiles that will be found associated with certified noble cultivars. Thus kava's can not be determined to have "tudai mixed in to it"."