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Ceramides

Ceramides in skincare: Barrier lipid. What it does on skin, how strong the evidence behind the claim actually is, the concentrations in normal use, who reacts to it, and where it stands in pregnancy and sunlight. On a label it appears as Ceramide NP, Ceramide AP, Ceramide EOP, Ceramide NG, Phytosphingosine.

Hydration, emollients and barrier repairBarrier lipidEvidence: Moderate

On the label: Ceramide NP, Ceramide AP, Ceramide EOP, Ceramide NG, Phytosphingosine. Also called: Older labels: Ceramide 3, Ceramide 6-II, Ceramide 1.

This is an ingredient reference, not a diagnosis and not a treatment plan. It describes what substances are and what the published evidence supports; it does not tell you what your skin has or what to put on it. A rash that spreads, hurts, weeps, does not settle, or comes with feeling unwell is a reason to see a doctor or pharmacist, not to change serum.

What it is

The main lipid family of the skin barrier. The outer layer is often described as bricks and mortar: the dead cells are the bricks, and the mortar is a set of stacked lipid sheets made of ceramides, cholesterol and free fatty acids in roughly comparable proportions. Ceramides are around half of that mortar by mass, and they are the part that is depleted in dry skin, in eczema and in ageing skin.

What it does on skin

Applied topically they contribute the same lipid classes back to the barrier and are incorporated into the sheets rather than sitting on top like an oil. The measurable consequence is lower water loss through the skin and a faster return to normal after the barrier has been stripped by soap, wind or over-exfoliation. They do not exfoliate, brighten or treat anything: they repair the wall.

What the evidence is worth

Evidence: Moderate

Moderate. Ceramide-containing moisturisers perform well in barrier-function studies and in atopic dermatitis, but the products studied are complete formulations, so the benefit cannot be assigned to the ceramides alone. One robust finding is that the ratio matters: an unbalanced mixture of the three lipid classes can slow barrier recovery rather than speed it, which is why the good products contain all three.

How it is used

In a leave-on moisturiser, morning and night, on damp skin. They are used at very low percentages and are expensive, so their position far down an ingredient list is normal and not a sign of underdosing. They are most worth paying for when the barrier is actually damaged: eczema, winter, or a routine that went too hard on acids.

Typical concentration in normal use: Fractions of a percent. That is a description of the market, not a recommendation, and it is not a dose.

Who reacts to it

Very well tolerated, including on eczema-prone and post-procedure skin. They are among the ingredients least likely to cause a reaction, which is why they dominate the "for sensitive skin" shelf.

Pregnancy and breastfeeding

Generally considered fine

No pregnancy concerns, and a ceramide moisturiser is a good replacement for whatever active has been paused.

Sunlight

No change

No effect on light sensitivity.

Rules and labelling

Not restricted. The naming is the practical issue: the numbered names were replaced by letter codes about a decade ago, so Ceramide 3 and Ceramide NP are the same substance on labels of different ages.

What it goes with, and what it does not

They work with cholesterol and fatty acids, which is why good formulas list all three, and they are the natural partner for a humectant such as glycerin. Layering a ceramide cream after an acid or retinoid is the standard way to stay on a strong active without wrecking the barrier.

One thing people get wrong

The myth is that "ceramides" on the front means a barrier repair product. Almost every moisturiser can add a trace and print the word. What tells you more is whether the formula also contains cholesterol and a fatty acid, because the balance of the three is what the barrier research actually points to.

Sources: EU Cosmetics Regulation (EC) No 1223/2009 and its annexes, as published in the European Commission's CosIng database, for every statement about what is permitted, restricted or banned · opinions of the Scientific Committee on Consumer Safety (SCCS) and safety assessments of the Cosmetic Ingredient Review (CIR) for the concentration positions · standard dermatology reference material for mechanism, tolerability and contact-allergy patterns · checked 2026-09-06. Deep links are deliberately omitted where a stable public URL could not be confirmed.

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