oh I thought nobody else in the forum knew about this special herb! It isn't that it's addictive, but if done right something that keeps you wanting more. The recommended dose is 200mg, I say go for 400mg in combination of 200mg-400mg of caffeine and you won't get the affect that DrewClement is talking about lol
The main thing you gotta watch out for is the countries that the product is imported from. Some may include contaminates which do fuck your kidneys. When I was taking the pill form imported from some african country I started to get cramps in my stomach from it, but that didn't stop me. If you ever get your hands on liquid extract then it's a better experience.
I would often make strong strong green tea and add about 400mg of kavakava extract to start my day. It gives you the positive attitude and relaxation without drowsiness or the jitters you may get from high intake of caffeine. In high dosages it also makes you lightheaded and numb in the face, mouth, and throat.