My recommendation: BIGTREA PREMIUM. Recently ordered, it is pretty good quality. Give it a try. They also have lab test available for all the batches, and you can choose from 3 strength. Not the cheapest, but at least good quality.

I know this is an old post, but how is this kratom so potent? I've tried multiple times and it is way stronger than any other kratom I've used. Do they add extracts you think?