Our natural indigo blue powder (Qingdai--Chinese Name) comes from the best origin of china---FuJian province,There are  more than 1000 years of cultivation history of   plant Common Baphicacanthus Rhizome and Root ,It is Natural Indigo traditional main source. Indigo  content is high as 2.0 - 3.8%, indirubin content is 0.15 - 2.0%, The product  is in full compliance with the 2005 version of "Chinese Pharmacopoeia."Our products are purchased directly from the processing base to prevent the occurrence of the phenomenon of adulteration.