Possibly cornstarch? Labeling somewhat deceptive.
I  bought this product because of a tight budget.  After I got got home, I noticed that it said it contained "Kava Kava," NOT "Kavaloctones" which are the active ingredients extracted from the Kava root. So, because I have had tasted true Kava before, I opened one of the capsules.  It did not have any taste of Kava. It appeared to be cornstarch or some other neutral filler.  I do not have the time, inclination or money to have this lab tested, but I suggest going with a better known brand, just in case I am correct.
Rating: 2 stars