TCM Herb for Pain Relief - Corydalis Rhizome (Yan Hu Suo) Corydalis is a tall, thin herb native to the Zhejiang province of China. The rhizome is used for medicinal purposes. Effects Promote blood flow and relieves pain This herb unblocks blood vessels, dissolves blood stasis and alleviates pain. It is an important herb for Pain in the chest, abdomen, and limbs as well as gynecological pain. Treats dysmenorrheal, coronary artery disease, irregular heart beat, and blood stagnation. Dosage and Administrations 3-10 grams in decoction, max of 20 grams, 1-1.5 grams in powder Research To date, a total of 20 alkaloids have been isolated in corydalis, the most powerful of which is a compound called tetrahydropalmatine (THP). Lab tests have shown that THP acts as an analgesic and sedative and can have a wide range of actions on the central nervous system. Cautions It is a prescription herb in China. Often used in combination with other herbs to treat different pain conditions. Do not use during pregnancy High dose can result in drowsiness, dizziness, and abdominal distention. Please only purchase herbs from qualified TCM Practitioner.