5α-Cholestane is primarily used as a reference standard in analytical chemistry, particularly in gas chromatography and mass spectrometry, to identify and quantify sterols and related compounds in biological samples. It serves as a key marker in the study of cholesterol metabolism and the analysis of sterol biosynthesis pathways. Additionally, it is utilized in research to investigate the structure and function of lipid membranes and their interactions with other molecules. In the pharmaceutical industry, it aids in the development of drugs targeting cholesterol-related disorders, such as atherosclerosis or hypercholesterolemia. Its stable structure also makes it valuable in studies of steroid hormone synthesis and degradation.