The main function of drug carriers is to deliver drug molecules to the desired target sites, reducing non-target exposure and increasing the exposure concentrations and duration per dose at the target cell(s).To achieve these aims, various properties have been incorporated into carriers, such as the ability to bind to the target sites, stealth characteristics to avoid the hosts immune system, and the ability to release drugs under desired conditions, at certain pH or temperature values.In most encapsulated drug systems, the carrier materials are the major content as compared with the payload drug content, and so it would be logical to make the carrier material possess a therapeutic function or biological activity.Here three carrier systems with their own activity will be presented, i) nanocarrier with self-antioxidative property for stabilizing and delivering ascorbyl palmitate, ii) carrier with self-antitumor activity that works synergistically with loaded paclitaxel, and iii) fragrance carriers with UV protection property.