Liposomes are microvesicles that encapsulate active ingredients within a lipid bilayer. Liposomes have a hydrophilic outer layer, a hydrophilic inner layer, and a hydrophobic bilayer, allowing them to encapsulate both water-soluble and lipid-soluble substances. The lipid bilayer of liposomes is structurally similar to that of intestinal cell membranes, making nutrients more readily absorbed by intestinal cells and resulting in higher bioavailability.