Panthenol (pro-vitamin B5): a quiet helper for your skin barrier

Panthenol doesn’t get the buzz of ceramides or niacinamide, but it shows up everywhere: in moisturizers, diaper creams, lip balms, hair conditioners and ointments for chapped skin. It’s been used on skin for decades. Here’s what it does, what the research shows, and the small print on who paid for most of it.

What is panthenol?

Panthenol is a pro-vitamin, meaning a substance your body converts into a vitamin. Once it’s absorbed into the skin, it becomes pantothenic acid, better known as vitamin B5.

It comes in two mirror-image forms, like a left and a right hand. Only the “right-handed” form, dexpanthenol, gets converted into vitamin B5, so that’s the active one. On ingredient lists you’ll usually see “panthenol”, which may be dexpanthenol or a mix of both forms. Most studies used dexpanthenol.

Vitamin B5 is part of coenzyme A, a helper molecule your cells need to build fatty acids and other fats. That matters because fats are what hold the outer layer of your skin together.

How panthenol works on your skin

Panthenol does two jobs.

First, it’s a humectant, an ingredient that attracts and holds water, like glycerin. Panthenol is hygroscopic (it pulls moisture in from its surroundings) and dissolves easily in water, so it helps keep the outer layer of skin hydrated.

Second, once it’s converted to vitamin B5, it may support the skin’s own repair work. Lab studies summarized in a 2020 review found that pantothenic acid helped fibroblasts (the cells that build the skin’s support layer) multiply, and that dexpanthenol changed the activity of genes involved in wound healing in lab-grown skin. Those are lab findings; the practical question is what happens on real people.

What barrier studies found

A handful of small human trials have tested panthenol on the skin barrier.

• Healthy skin, one week: In a randomized, double-blind study of 60 healthy volunteers published in 2000, a panthenol cream applied twice a day for seven days improved skin hydration and reduced transepidermal water loss (TEWL, the water that evaporates through your skin) compared with the same cream without panthenol.
• Irritated skin: In a 2002 study, researchers deliberately irritated small patches of skin with sodium lauryl sulphate, a harsh detergent. Patches treated with a panthenol cream repaired their barrier faster, stayed better hydrated and were less red than patches treated with the plain base cream.

These results are consistent, but the studies are small and short, and they measured skin readings in a lab rather than how people’s dry skin felt over months. That’s typical for skin care ingredients. It means panthenol probably helps, but we can’t say by how much in everyday life.

Panthenol, eczema and wound care

Eczema

A 2022 review looked at panthenol for atopic dermatitis (the common, itchy, inflammatory form of eczema). It described a pilot study in children where a panthenol cream did about as well as a mild hydrocortisone ointment, and a study in children with stable mild eczema where fewer had flares with a panthenol cream than with a comparison cream. The reviewers concluded panthenol is a reasonable moisturizing ingredient for eczema, while noting the evidence is limited. The review had no outside funding, but three of its authors had taken part in expert panels organized by a panthenol cream manufacturer.

Minor wounds and procedures

Panthenol ointments are widely used on scrapes, chapped skin and skin after cosmetic procedures. A 2020 review pulled together studies on healing after laser treatment, tattooing and skin graft donor sites, which found faster healing or barrier recovery with panthenol in several cases. For example, in one study small laser wounds healed faster over the first few days with a panthenol ointment than with petroleum jelly.

Here the conflict of interest is bigger: the 2020 review was written with funding from a manufacturer, and several authors were its employees or consultants. That doesn’t make the results wrong, but it’s a reason to read them as promising rather than settled.

For anything deeper than a minor scrape, a burn that blisters, or a wound that isn’t healing after a week or so, see your doctor or pharmacist rather than relying on a cream.

Is panthenol safe? A note on allergy

Panthenol is one of the gentler ingredients around. It converts quickly to a vitamin your body already uses, and the 2022 review describes it as generally well tolerated.

But “gentle” isn’t “never”. Allergic contact dermatitis (an itchy rash from an immune reaction to something touching the skin) to panthenol has been reported in medical journals for decades. A 2018 study from a Portuguese hospital patch-testing clinic found that 26 of 2,171 patients tested (1.2 percent) reacted to dexpanthenol. Most had long-standing eczema, and in most cases a panthenol cream was the likely source.

Those were people already referred for suspected allergies, so the rate in the general public is likely much lower. The authors’ point was that panthenol allergy is probably overlooked, because people assume a soothing cream can’t be the problem. If a rash keeps getting worse while you use a “healing” cream, that’s worth mentioning to your doctor.

Choosing and using panthenol products

• Think of it as a helper, not a hero. Panthenol works alongside other moisturizing ingredients. The overall formula, and whether you use it consistently, matter more.
• Ointments and balms are good for cracked or chapped spots like knuckles, lips and noses in a Canadian winter, since the greasy base holds moisture in while the panthenol draws it in.
• Look for fragrance-free versions if your skin is sensitive, so you’re not adding a known irritant to a soothing ingredient.
• Stop if things get worse. A rare allergy is possible with any ingredient, including this one.

If you’re comparing options, you can browse moisturizers or balms and ointments reviewed by the panel.

Panthenol is a quiet, dependable ingredient: a humectant that becomes vitamin B5 in your skin, with small but consistent studies showing better hydration and faster barrier repair. A lot of that research is tied to manufacturers, and a small number of people are allergic to it. For most skin, though, it’s a sensible thing to find on a moisturizer label.