Honso USA is tested for heavy metals, purity, and microbial content to eliminate any contaminant. Most important of all, Honso tests the levels of key chemical constituents of at least two marker herbs by HPLC for quality control on every formula. Japanese Kampo is a unique approach to the ancient art of Chinese medicine. Most of the Kampo formulas were adopted from classical Chinese medicine of the Han Dynasty. Honso is making a long-term commitment to complementary and alternative medicine practitioners in the world. Herbspro.com is proud to carry the entire range of this fine brand.