Ceramide AP

Ceramide AP is a phytosphingosine-based ceramide with an α-hydroxy fatty acid — historically labelled Ceramide 6-II. It is one of the major ceramide classes in human stratum corneum and is commonly paired with ceramide NPCeramide NPModerateCeramide NP · Sphingolipid (non-hydroxy fatty acid, phytosphingosine)The most abundant ceramide class in the stratum corneum; topical replacement improves barrier in controlled trials.Open in the Index → and ceramide EOPCeramide EOPModerateCeramide EOP · Skin-identical ω-esterified ceramideLong ω-hydroxy esterified ceramide (formerly Ceramide 1) critical for stratum corneum lamellar organisation.Open in the Index → plus cholesterolCholesterolStrongCholesterol · Sterol barrier lipidEssential stratum corneum lipid; with ceramides and free fatty acids it reconstitutes the barrier lipid triad.Open in the Index → and fatty acids in barrier formulas[1].

What it does

Ceramides organise with cholesterol and free fatty acids into lamellar bilayers that limit TEWL. Topical multi-ceramide systems can support barrier repair in dry and atopic-prone skin when the full lipid triad is present[1][2].

The evidence

Human SC lipid research established AP as a native class; clinical benefit is best documented for complete ceramide–cholesterol–FFA systems rather than AP alone[1][2].

How to use it

Look for products listing several ceramides with cholesterol (as in many CeraVe-style creams). Alone it is not a miracle active — the matrix matters.