The contents of heavy metals in boiled Sibjeonaebotang with those in its herbal ingredients are compared. The herbal medicines of Sibjeonaebotang were bought at 10 defferent markets. The contents of 14 heavy metals (Ag, As, Ba, Cd, Cr Cu, Fe, Hg, Mn, Ni, Pb, Sb, Sn, Zn) were analysed using ICP It was found out that 5 heavy metals (Pb, As, Ba, Fe, Sb) were detected in only one boiled Sibjeonaebotang But they were detectable in all Sibjeonaebotang and its herbal before boiling. For example the content of Hg in one pack of Sibjeonaebotang before boiling was 0.064$pm$0.016 me and Hg in boiled one was 0.002$pm$0.005mg. These results suggest that boiled Sibjeonaebotang which we take is less harmful than herbal medicine itself by heavy metals.