Liposomes provide an excellent way to enhance nutrient bioavailability, drug uptake and absorption, vaccine delivery and the delivery of therapeutic genes. The ability of liposomes to fuse with the plasma membranes of barrier and target cells increases the diffusability of hydrophilic and hydrophobic molecules into cells and throughout the body. In addition to the increased diffusibility of liposomes, decorating liposomes with target ligands presents a promise to more selectively deliver drugs, nutrients and therapeutic genes with enhanced bioavailability and uptake into target cells. This book presents the use of liposomes and gives examples of the wide range of uses of liposomes in medicine, health and biotechnology.