Celandine fresh herb and root (Chelidonium majus) is a cholagogue useful for insufficient bile with clay-colored or gray-colored stools, and for stagnant liver with flank pain. Celandine helps prevent gall stone formation, and is used with Chionanthus to expel biliary calculi. Celandine also has marked anti-viral activity against retrovirus, and is used externally for warts.