But be careful if you toss 'n wash micro. It does contain root fiber (where instant does not), which could cause to some side effects in the stomach (i.e. gas, bloating, nausea, etc.)
You are right, you have to watch out for micronized powders, they can cause the effects you mentioned.
But mine does not, that is why I take out what is called "makas", that's what this statement says---"During the processing, the Kava is painstakingly filtered to remove all coarse fibers and extraneous plant material."
It is all this course fibers that can cause the unwanted effects as well as the kavalactones DHK and DHM and my kava is not high in these kavalactones. So when you get my micronized you are getting some of the best micronized kava out there, guaranteed.
Aloha.
Chris