>https://www.nature.com/articles/s41565-023-01565-2 Nature Nanotechnology, Published online: 02 January 2024;
doi:10.1038/s41565-023-01565-2Insulin injections are not ideal and have an increased risk of hypoglycaemia. A preferable oral formulation based on silver sulfide quantum dots coated with a chitosan/glucose polymer is discussed, which has controlled insulin release and reduced risk of hypoglycaemia, and demonstrates applications in rodent and non-human primate models.