Liposome Drug Delivery: A Promising Nanocarrier System for Targeted Therapeutics Liposome Components and Structure Liposomes are composed of natural or synthetic phospholipids that self-assemble in aqueous environments. The phospholipid molecules contain lipophilic fatty acid "tails" and hydrophilic phosphate "heads". When mixed with water, the phospholipids spontaneously form concentric bilayers resembling an onion. An internal aqueous core allows water-soluble molecules...