Several types of polymers are used in the design of nanoparticles, including biodegradable polymers like polylactic acid (PLA) and poly(lactic-co-glycolic acid) (PLGA). These materials are broken down into non-toxic byproducts that are easily eliminated by the body. Other polymers, such as polyethylene glycol (PEG), are used to enhance the circulation time of nanoparticles in the bloodstream.
