Ceramides
In plain terms
The barrier lipids your skin already uses to hold moisture in and keep irritants out. Replacing what age and harsh products strip away, they are among the gentlest ingredients in skincare, recommended even for eczema and babies.
What the evidence shows
Ceramides are the lipids your own skin uses to build its barrier, making up around half of the outer layer's lipid content and acting as the mortar between skin cells that holds water in and keeps irritants out. Because they replace something your skin already makes and loses with age, they are among the most reliably gentle ingredients available. The CIR expert panel reviewed them and found them safe at the concentrations used, and they were not sensitizing in testing; no major regulator, including the FDA, Health Canada, the EU, or South Korea, restricts them. In practice dermatologists reach for ceramides precisely for the most reactive skin, in creams for eczema, rosacea, and atopic dermatitis, and for children, and they tend to make other actives easier to tolerate rather than harder. The only distinction worth knowing is not a safety one. Products use either plant-derived or lab-made ceramides, and both are well tolerated; the type numbers you see on labels and the common pairing with cholesterol and fatty acids are about how effectively a product rebuilds the barrier, not about whether it is safe to use. There is no hormone, cancer, sun-sensitivity, or pregnancy question attached to them.
On the label
Listed by type, like ceramide NP, AP, EOP, or the older ceramide 1, 3, and 6-II. Whether plant-derived or lab-made, both are well tolerated; the type numbers and the pairing with cholesterol and fatty acids are about how well a product works, not whether it is safe.