If I drink a lot of Fijian it effects my lower tract next day. And only when I drink a lot of 100% Waka. If I mix it 50/50 with Lownena it seems to be OK. I really like the taste of the 50/50 mix a lot. It's actually become my favorite tasting Kava. Although, it's hard to compete with the taste of any GHK Kava. I want to sample the Vulu anyway so if it's still there at the end of the day I'll take it.