Compared with normal mice, the concentration of serum zinc in zinc-deficient mice was significantly increased after oral administration of 1ml of 1000ppm ZnSO4 solution, while that of zinc-deficient mice treated with Kampo (Pogostemi Folium et Rhizoma, Perilla Herba, Saussureae Radix, Aurantii Nobilis Pericarpium, Anemarrhena Rhizoma, etc.) was not increased. The intestinal mucosa of zinc-deficient mice was also remarkably injured with administration of ZnSO4 but the Kampo formula inhibited its injury.