I would just like to say that after trying a number of kavas, Stone Kava has remained the best and my personal favorite. Very heavy effects, unique (good) taste and excellent for sleeping. I tried Boroguru since people said it was similar, but I think Stone even beats Boroguru. The stuff is so potent that even when I filter out the sediment it's still stronger than a cup of Boroguru. If you haven't tried Stone kava for some reason, give it a try!