Nanogels are non-ionic and ionic nanosystems that are made from physically or chemically cross-linked polymers, either hydrophilic, hydrophobic, or amphiphilic. The nanogel-forming materials may also consist of polysaccharides and proteins, which are selected based on their biodegradable, less immunogenic response. These are made to be particularly successful in increasing the drug payload in the targeted region and controlling the propensity of all the other nanocarriers to leak the loaded bioactive. NGs with a diameter ranging between 1 and 1000 nm integrate the properties of hydrogels and...