Your best bet is to get a sampler pack. Everyone's body reacts differently to different kavas. I have fibro and kava can be very effective at helping, but trying a few different ones will give you an idea which is better for you. Regardless of what you get, it should be medium grind. Medium grind has much more body effect than micro. GHK is the best vendor I've tried. My favorite is Mahakea. It's more of a balanced kava, which is what works best for me. I suggest trying a heavy, a medium, and a heady kava so you can see which type is the best for your needs.