I LOVE that they show you kavalactone percentages. Some vendors claim to test but for some reason dont share this data with customers?!?
It'd be great to have a reliable way to gauge the expected potency of a kava, but (unfortunately) KL% is not a reliable indicator of the efficacy and potency of kava.
One reason vendors don't post KL% is because they fear customers might put too much stock in it and might avoid a great kava just because it has a low KL%.
Another reason is that labs use different methods to determine that figure and the result will be different depending on the method used. For example, the Applied Sciences Lab at the University of the South Pacific in Fiji uses a more precise method than the one more commonly used by US labs, but as a result kava tested there will usually be 3-4% higher in KL than the same kava tested in most US labs.
As for the vendor being discussed in this thread, I find what they've done a bit odd. They printed the KL% on the labels, which is a poor choice because this figure is supposed to change from batch to batch. Then again, maybe they always print the exact number of labels they need per batch. Curiously, the COA they post includes a KL% for the Lawena, but this has been cropped out of the COA for the Waka and Chiefs Jungle products.
In any case, I noticed their most expensive kava (Chiefs Jungle) is listed at 10.22%KL on their website, and 11.22% on the label. A typo, maybe. Anyway, note how this is 3% lower than the cheaper "Waka" they sell. What they call their best kava doesn't have the highest KL%, which reflects my earlier point about KL% being a poor indicator of kava quality.