Heparin loaded nanoparticles are nano-sized carriers, typically ranging from 1 to 100 nanometers, that encapsulate heparin. The primary purpose of these nanoparticles is to enhance the therapeutic efficacy and safety profile of heparin by improving its bioavailability and reducing side effects. These nanoparticles can be fabricated using various materials such as polymers, lipids, and inorganic particles.