Ceramide stable isotopes refer to a group of lipids that are labeled with stable isotopes, allowing for accurate and precise tracing of their biological roles and functions. These isotopes are particularly useful in studying the metabolism and signaling pathways of ceramides, which play a critical role in cellular processes such as apoptosis, inflammation, and cell growth. The use of ceramide stable isotopes has helped researchers to better understand the complex mechanisms underlying various diseases, including cancer, diabetes, and neurodegenerative disorders.