C30(ω-hydroxy) Ceramide is a bioactive sphingolipid found in the stratum corneum layer of mammalian epidermis. C30(ω-hydroxy) Ceramide is vital to skin barrier functions and has a role in maturation of epidermis cells of the spermatozoa/testes. C30(ω-hydroxy) Ceramide deficiency causes defective skin-water permeability barrier function and neonatal lethality in elongation of very long chain fatty acids-4 (ELOVL4) deficient mice. [Matreya, LLC. Catalog No. 2080]