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Panthenol

Panthenol in skincare: Humectant, barrier and repair support. 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 Panthenol.

Hydration, emollients and barrier repairHumectant, barrier and repair supportEvidence: Moderate

On the label: Panthenol. Also called: Provitamin B5, dexpanthenol, D-panthenol.

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 alcohol form of pantothenic acid, vitamin B5, which skin converts into the vitamin itself. Pantothenic acid is a building block of coenzyme A, which cells use in fat synthesis — including the lipids of the barrier. In pharmacy it appears as dexpanthenol in the ointments used for nappy rash, chapped nipples, minor grazes and tattoo aftercare, which is where its reputation comes from.

What it does on skin

Two things at once. As a small water-binding molecule it hydrates the outer layer and reduces the tightness of dry skin. Beyond that it supports the repair of a damaged barrier and reduces the redness and irritation of skin that has been stripped, chapped or over-treated. It is the quiet ingredient in "soothing" products that is actually doing something.

What the evidence is worth

Evidence: Moderate

Moderate: dexpanthenol has been tested in controlled studies of barrier repair and irritant dermatitis, including experimental models where skin is deliberately stripped and recovery is measured. The strongest data sit with the pharmacy-strength ointments rather than the 1-2% in a serum, but the direction is consistent and the risk of harm is close to zero.

How it is used

Anywhere skin is irritated: after a retinoid ramp-up, after shaving, after sun, on chapped hands in winter. In leave-on products at 1-5%; in hair conditioners it coats and softens the fibre instead. It is a good default addition to a routine that keeps tipping into irritation.

Typical concentration in normal use: 1-5%. That is a description of the market, not a recommendation, and it is not a dose.

Who reacts to it

Very well tolerated. Contact allergy exists but is uncommon, and is most often reported in people using dexpanthenol ointments repeatedly on damaged skin, where any ingredient has more opportunity to sensitise.

Pregnancy and breastfeeding

Generally considered fine

No pregnancy concerns; dexpanthenol preparations are widely used during and after pregnancy for exactly the chapping problems that come with it.

Sunlight

No change

No effect on light sensitivity. It is often used after sun exposure for comfort, which does not treat the damage — it treats the discomfort.

Rules and labelling

Not restricted in cosmetics. The pharmacy ointments are medicines and carry their own labelling.

What it goes with, and what it does not

Excellent with ceramides and glycerin, and the standard partner for a retinoid or acid routine that has gone slightly too far. It also pairs well with niacinamide in a calming product.

One thing people get wrong

The myth is that it is a vitamin supplement for skin — that applying B5 does what a deficiency correction would. Pantothenic acid deficiency is essentially unheard of in a normal diet, so nothing is being corrected. Panthenol earns its place as a humectant and barrier-repair ingredient, not as nutrition applied to the outside.

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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