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Petrolatum

Petrolatum in skincare: Occlusive. 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 Petrolatum.

Hydration, emollients and barrier repairOcclusiveEvidence: Strong

On the label: Petrolatum. Also called: Petroleum jelly, white soft paraffin, Vaseline (brand).

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

A semi-solid mixture of hydrocarbons refined from petroleum. Cosmetic and pharmaceutical grades — white petrolatum in the pharmacopoeias — are highly refined, which is the entire safety question and the entire difference from the crude material. It has been in medical use since the 19th century and remains one of the most-used substances in dermatology.

What it does on skin

It is the most effective occlusive available: a film of it reduces water loss through the skin by more than 90%, an order of magnitude more than most plant oils manage. It contributes nothing chemically. It simply stops water leaving, which lets a damaged barrier rebuild itself, and it protects skin from friction, urine, saliva and cold wind.

What the evidence is worth

Evidence: Strong

Strong. It is first-line in atopic dermatitis, in chapping, in cracked heels and lips, and in wound aftercare, and it outperforms far more expensive products on the one measure it is for. It is also so unlikely to cause an allergy that it is used as the neutral base in which other substances are tested during patch testing.

How it is used

Thinly on damp skin, last, over everything else. Its most valuable use is the one people skip: a thin layer over a moisturiser on cracked hands, heels or lips overnight. It does not absorb, and it is not supposed to. On the face, some people find it too heavy while others use it nightly with no problem.

Typical concentration in normal use: Up to 100%. That is a description of the market, not a recommendation, and it is not a dose.

Who reacts to it

Allergy is exceptionally rare. The realistic complaints are cosmetic — greasy, shiny, transfers onto pillowcases — and a subset of acne-prone people find it aggravating on the face. It should not be applied to a wound that is infected or that has not been cleaned.

Pregnancy and breastfeeding

Generally considered fine

No pregnancy concerns. It is one of the standard recommendations for the itching and chapping of pregnancy and for nipple care afterwards.

Sunlight

No change

No effect on light sensitivity. It is not a sunscreen and provides no ultraviolet protection.

Rules and labelling

Under EU cosmetics rules petrolatum may only be used where the full refining history is known and it can be shown that the substance it is produced from is not carcinogenic. That condition is the regulation dealing directly with the internet worry about petroleum products, and it is why cosmetic-grade material is not comparable to industrial residues.

What it goes with, and what it does not

It is the sealing layer over glycerin, hyaluronic acid or a ceramide cream — humectant first, occlusive on top. Do not apply it under a strong active expecting better penetration: occlusion increases absorption and can turn a tolerable retinoid into an irritating one.

One thing people get wrong

The myth is that it suffocates skin. Skin takes its oxygen from the blood, not the air, and petrolatum is not a barrier to gas in any way that matters. The related myth, that it is carcinogenic, comes from unrefined petroleum fractions that contain aromatic contaminants — which is exactly what the refining requirement for cosmetic grades exists to exclude.

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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