Corydalis yanhusuo comes from the tubers of the *Corydalis yanhusuo* plant. This specific form contains more tetrahydropalmatine (THP) than other Corydalis types. THP is an alkaloid that acts on the central nervous system. The herb appears in supplements meant for relaxation, restful sleep, and occasional feelings of tension or mild discomfort.
People reach for it during stressful periods to settle the mind. Others take it before bed to help fall asleep. Some rely on it for passing physical annoyances like minor headaches or menstrual cramping. Traditional use and early observations support these applications.
Typical forms are capsules, tablets, or tinctures, often used in the evening or as the need arises. THP causes drowsiness. Do not drive or use heavy machines after taking it. Published case reports link long-term or high-dose Corydalis use with liver toxicity. Anyone with a liver condition or anyone taking medications processed by the liver should be careful.