It is a popular herb from Japan, Korea and Tibetan region. Root extracts from the flowering herbal plant Corydalis yanhusuo has widely used for centuries as a pain treatment. In a new study, Olivier Civelli, professor and chair of pharmacology at the University of California, Irvine, and colleagues show how This effectively treats different forms of pain. Most notably it can reduce chronic neuropathic pain which is poorly treated with common medicines. They also show that this seems to not lose its potency over time, as happens with many analgesics. Study results appear in one open-access online journal, PLOS ONE. Additionally, the researchers found that it’s use did not lead to tolerance.