Sphingosine (d15:1) is widely used in lipid research and biomedicine due to its role as a key intermediate in sphingolipid metabolism. It is particularly valuable in studying cellular signaling pathways, as it is a precursor for important bioactive molecules like ceramides and sphingosine-1-phosphate (S1P). Researchers utilize it to investigate its involvement in processes such as cell proliferation, apoptosis, and inflammation. Additionally, it serves as a standard in mass spectrometry-based lipidomics to identify and quantify sphingolipids in biological samples. Its applications extend to drug development, where it is used to explore therapeutic targets for diseases like cancer, neurodegenerative disorders, and metabolic syndromes.