Ba-wei-wan was administered for 7 months to 24 aged, non-hospitalized subjects. Laboratory examinations showed an improvement in serum or plasma levels of total lipid, LPO and HDL-C. Other blood examinations were shown to be unaffected by the treatment. To reconfirm the effects of Ba-wei-wan on lipid metabolism, the three step administration of the drug was employed. The elevation of HDL-C levels and the decrease of LPO levels were obtained by this treatment. The discontinuation of this drug induced the converse effect on the plasma levels; decreased HDL-C and increased LPO. It could be concluded from these results that Ba-wei-wan administration improved the lipid metabolism in the aged subjects.