At least one peptide molecule selected from EGDGHLGKPGROGE (SEQ ID NO:1), EKDGHPGKPGROGE (SEQ ID NO:2), G(POG)4, (POG)3, G(POG)2, (POG)2, (POG)4, (POG)5 and G(POG)3, and pharmaceutically acceptable salts thereof is effective for inhibiting various diseases such as osteoporosis, osteoarthritis and pressure ulcer. The peptide molecule is easily absorbed into a body and migrates into cells in an intestinal tract, and strongly binds to a nucleic acid compound or the like to form a complex, and thus functions well as a carrier component for delivering the nucleic acid compound or the like without causing the problems associated with conventional DDS techniques.
