The present invention provides a carrier containing a first block copolymer and a second block copolymer, wherein the first block copolymer is a block copolymer of a first non-charged segment and a first complex-forming segment, at least some proportion of said first block copolymer is modified by a first molecule, the second block copolymer is a block copolymer of a second non-charged segment and a second complex-forming segment, and wherein at least some proportion of said second block copolymer is modified by a second molecule, said first molecule is a GLUT1 ligand, and said second molecule is different from the first molecule.
