There was a thread about this exact topic on this section perhaps a week ago. Use the search function, it works (sometimes...).
Powdered is fine. Looks a bit more suspicious. I get around 1% usually. I agree with psyren that smaller 50-150gram extractions are the most efficient.
بسم الله الرحمن الرحيم
Fairly responsible Kratom user.
"whenever he drank ayahuasca, he had such beautiful visions that he used to put his hands over his eyes for fear somebody might steal them."
in between the grinding-brakes of a train crash while aluminum-foil robots make obnoxious sex noises on a static-filled walkie-talkie radio.