Noble vs. Non-Noble Kava. Scholars make a distinction between the so-called “noble” and non-noble kava. The latter category comprises the so-called “tudei” (or “two-day”) kavas, medicinal kavas and wild kava (Piper wichmanii, the ancestor of domesticated Piper methysticum).[6][14] Traditionally, only noble kavas have been used for regular consumption due to their more favorable composition of kavalactones and other compounds that produce more pleasant effects and have lower potential for causing negative side-effects, such as nausea or “kava hangover.”