Kamwo September 16, 2016 Corydalis yanhusuo extract for use as an adjunct medicine for low to moderate chronic pain Kamwo September 16, 2016 In a new study, Olivier Civelli, professor and chair of pharmacology at the University of California, Irvine, and colleagues show how YanHuSuo effectively treats different forms of pain. Photo by Kamwo. Image sourced from Kamwo.