4'-Hydroxychalcone is a chalcone isolated from licorice root, with hepatoprotective activity. 4'-Hydroxychalcone inhibits TNFα-induced NF-κB activation via proteasome inhibition. 4'-Hydroxychalcone induces a rapid potassium release from mitochondrial vesicles and causes deterioration of respiratory control and oxidative phosphorylation of isolated rat liver mitochondria.