Novel polyallylamine (PAA) based graft polymers are provided, including groups such as cholesteryl, cetyl, palmitoyl, which are adapted to deliver an entity that is normally of poor solubility in an aqueous medium, said entity being such as a drug, peptide, protein, or polynucleotide that is releasably contained within the said polymer, the resulting complex being of nanoparticle range sizes with a Tg of less than 37° C. and deliverable in aqueous media as micelles of typically 100 to 500 nm in hydrodynamic diameter, thereby offering a delivery vehicle capable of oral or parenteral administration that protects the entity from enzymes and critical pH changes.