Mr. Blythe of Root of Happiness comes across as a condescending prick. I shall respond in kind. Either he has never seen kava growing on a farm, or he has and is just lying in order to smear his competitors and their products. Kava isn't irrigated outside of the US. Nowhere other than Hawaii have I seen kava irrigated. Manure for fertilizer? Manure is used for fertilizer everywhere in the world for all sorts of crops and has been since early man tired of hunting and gathering. That said, I've never seen manure used as fertilizer for kava. Animal manure isn't easy to come by in significant quantities in the South Pacific... in Fiji it's only used (chicken manure when available) for vegetable crops. Occasionally artificial and organic fertilisers (NPK) are used for kava, but this is rare because of the risk of the fertilizer burning lateral roots. He should speak for himself and his product. What testing is done is entirely up to the buyer. In Fiji, kava is tested (klactone %, chemotype) at the University of the South Pacific. For a bit more $, they'll gladly test for all the scary things he's worried about. Mold is not uncommon, but if you have a good supplier who values their product and your relationship, they'll source good, clean kava for you. We should ignore the scientists and listen to Mr. Blythe, peddler of product made using ethanol. He judges the threat posed by some things by the number of reported incidents in which they are culprits... but other things he judges to be "serious threats" despite no reports at all.