lipid micelles
Lipid-core micelles are formed by amphiphiles in aqueous solutions, which are generally suggested to be delivery systems for water-insoluble molecules and pharmaceutical drugs. Small drug molecules, particularly insoluble drugs, can be encapsulated within micelles during their formation. The delivered drugs can be retained in the blood circulation for long periods due to the fact that the inner molecules cannot cross the amphiphilic molecules easily. The drug delivery mechanisms of lipid-core micelles are roughly similar to liposomes.