 Nanosyria are cerium oxide nanoparticles with a wide range of applications, particularly in the biomedical field. They can be synthesized through both chemical and green methods, and their characteristics and applications have been studied extensively. Recent research has focused on the potential toxicity of nanosyria when they come into contact with humans or animals, as well as their antimicrobial, antioxidant and anti-cancer properties. This article was authored by S. Rajskumar and Poonam Naik.