A liposome is a spherical vesicle composed of lipid bilayers that can encapsulate various substances, including drugs and nutrients. In the context of hair loss and hair biology, liposomes are relevant for their potential to enhance the delivery of therapeutic agents directly to hair follicles, improving treatment efficacy. Key distinguishing characteristics of liposomes include their ability to protect encapsulated compounds from degradation and their biocompatibility, which allows for targeted and sustained release in biological systems.