A major lipid of the water barrier
Review2003 review
Ceramides structure the lipid lamellae of the stratum corneum and the water barrier. The authors stress that the link between a ceramide deficit and skin disorders is hard to prove, and consider topical supplementation promising8.
Three lipid classes, one network
Review2023 review
Ceramides, cholesterol and free fatty acids form a lipid matrix, the only continuous pathway through the stratum corneum. It governs how substances enter the skin6.
Complete mix or single lipid
LaboratoryMouse skin, preliminary tests on damaged human skinWater loss measurement
One or two of these lipids applied alone delay barrier recovery; an equimolar mix of ceramides, cholesterol and fatty acids allows it normally. Speed-up of up to a threefold ratio12.
What recent reviews say
Review2025 review
Ceramides provide a water barrier, hydration and pH regulation. They can be supplied directly, through pseudo-ceramides or through actives that stimulate natural synthesis13.
Calculated margin of safety for ceramide 3
Safety assessmentExposure model0.5 to 10% assumed
The margin of safety indicates no concern below 1% ceramide 3. It is 149 for a 3% face cream, 168 for a 5% body milk on the back and 4,111 for a 10% lipstick14.