The present invention relates to a composition in the form of a nano- or micro-emulsion, comprising: (a) at least one oil； (b) at least one nonionic surfactant with an HLB value of from 8.0 to 14.0, preferably from 9.0 to 13.5, and more preferably from 10.0 to 13.0； (c) at least one ceramide compound； (d) at least one compound selected from Vitamin B3 and derivatives thereof； and (e) water. The composition according to the present invention can be used as a cosmetic composition and can enhance or improve the penetration of a ceramide compound into a keratin substance such as the skin.
