From the Vendor: Our Yellow Hulu Kapuas is extremely high quality and tests at 2.1% Mitragynine. We remove all veins and stems and then grind into a very fine floury texture. Our kratom is not course grind! Yellow Hulu Kapuas Kratom is from the Vietnam region, as the name would suggest. It is often compared to Hulu and Kapuas. It has similar benefits. Yellow Hulu Kapuas contains a lot of mitraphylline, mitragynine and 7-hydroxymitragynine, and mitragynin. In fact, it contains more of these alkaloids than any other strain.