Humectant vs occlusive skincare: what dry winter skin needs

Humectant vs occlusive skincare comes down to one question: are you adding water to your skin, or keeping it there? You put on a hydrating serum after your evening shower, your face feels plump for twenty minutes, and by the time you are reading in bed it feels tight again. The serum did its job. The problem is what came after it, or what didn’t, and in winter that decides whether your routine lasts until morning.

What is the difference between a humectant and an occlusive?

A humectant pulls water into the outer layer of skin; an occlusive forms a film that slows that water from escaping. Common humectants are glycerin, hyaluronic acid and urea. Common occlusives are petrolatum (petroleum jelly), lanolin, mineral oil and silicones such as dimethicone.

The cleanest look at how the two divide the work comes from a 2020 French trial. Researchers took a cream containing both glycerol (glycerin) and petrolatum and tested four versions on the forearms of 51 volunteers with dry skin: the full cream, its base alone, the base with only glycerol, and the base with only petrolatum. They measured water loss through the skin and skin moisture for 12 hours. The full cream lowered water loss more than the glycerol-only version, and raised skin moisture more than the petrolatum-only version. The authors concluded that the cream worked “with the petrolatum component improving skin barrier function, with a reduction in TEWL, and the glycerol component improving skin hydration.” TEWL stands for transepidermal water loss, the water that evaporates out through the skin. The study was run with the cream’s manufacturer, so read it as a clear demonstration of mechanism rather than a product endorsement.

Can humectants dry out your skin?

They can make dryness feel worse when they are left unsealed in dry air. A humectant does not create water. It borrows it, either from humid air around you or from the deeper layers of your own skin. A 2016 dermatology review explains that humectants “attract water from two sources, from the dermis into the epidermis and in humid conditions from the environment.” In a heated room with low humidity, the second source mostly disappears.

The same review calls humectants “a double-edged weapon as they increase TEWL by enhancing water absorption from the dermis into the epidermis where it is easily lost to the environment.” That is the tight-by-bedtime pattern: water is drawn up to the surface, and with nothing on top, some of it evaporates. We cover the same question for one ingredient in our guide on whether hyaluronic acid dries out skin.

This does not make humectants a bad choice in winter. It means they need a partner. Glycerin in particular has a strong record: a Swedish study in which 17 volunteers used a 20% glycerin cream for 10 days found clearly higher skin hydration readings, and a German review notes that “the increase of epidermal hydration by glycerol is critical in skin conditions aggravated by dry and cold environmental conditions, e.g. winter xerosis.” Xerosis is the medical word for dry skin.

Why does winter make the choice matter more?

Because cold, dry air weakens the barrier that keeps water in, so a routine that only adds water loses more of it. A 2016 Danish review of the research concluded that “low humidity and low temperatures lead to a general decrease in skin barrier function and increased susceptible towards mechanical stress.” Skin also becomes more reactive to irritants in those conditions.

In summer, a humectant serum and a light gel can be enough because humid air slows evaporation for you. In January, with the heating on, you have to do that part yourself. That is where an occlusive earns its place. If you are adjusting a whole routine for the season, our guide on how to change your skincare routine for winter walks through each step.

What is the best occlusive for winter skin?

Petrolatum is the most studied and the most effective at stopping water loss. The 2016 review reports that “petrolatum in a minimum concentration of 5% reduces TEWL by more than 98%,” while lanolin, mineral oil and silicones reduce it by only 20 to 30%. A separate review notes that petrolatum has “an immediate barrier-repairing effect in delipidized stratum corneum”, meaning skin that has been stripped of its own fats.

The trade-off is feel. Petrolatum is greasy, and on the face many people find it too heavy for daily use. Practical options, depending on your skin:

• Very dry or flaking areas (around the nose, mouth, cheeks): a thin layer of petrolatum or a balm at night only. Our article on whether slugging works for dry, tight skin covers the full-face version and who should skip it.
• Normal to dry skin: a cream moisturizer that already combines humectants with oils such as squalane or a silicone such as dimethicone.
• Oily or breakout-prone skin: a lighter lotion with dimethicone, and a heavier occlusive only on dry patches. The same review notes that “silicone-based derivatives are suitable for oily skin.”

How do you layer humectants and occlusives?

Humectant first, on damp skin; occlusive last. A humectant applied while skin is still slightly damp has water close at hand to hold, and the occlusive on top then slows that water from leaving. A Swedish study on humectants found that glycerol and urea “promote skin hydration and permeability even at reduced water activity”, meaning they still pulled water into the skin when the formula itself was less watery.

A simple evening order looks like this:

1. Cleanse with lukewarm water and pat your face so it stays a little damp.
2. Apply a hydrating toner, essence or serum with glycerin or hyaluronic acid.
3. Follow with your usual moisturizer within a minute or two.
4. On dry nights, press a thin layer of an occlusive over the driest areas.

Keep the occlusive step thin. A heavy layer does not seal better than a thin one, it just transfers onto your pillow.

Is a humectant or an occlusive better on its own?

Neither is a full solution alone, and the research shows why. In the Swedish glycerin study, hydration rose but water loss through the skin did not change. In the French trial, petrolatum alone cut water loss but raised moisture less than the full cream. Glycerol does have barrier benefits of its own: in a 1999 study from Germany and Italy, glycerol-treated skin recovered its barrier faster after damage, with differences still visible 7 days after treatment ended. But in a dry room the quickest relief comes from using both.

If you have to pick one, choose by symptom. Skin that feels tight and looks dull but is not flaking usually needs more water, so a humectant. Skin that is rough, flaking or stings when you apply products usually needs the barrier protected first, so an occlusive or a richer cream.

Editor’s note

When I lived in the UK, the cold outside and the dry indoor air made moisture my first priority, and I built it up in layers rather than relying on one heavy cream. In every season I layer LANEIGE Cream Skin as a mist, spraying rather than patting it in. When my hands get dry and cracked, I apply a thick layer of Bepanthen ointment, put on plastic gloves and sleep in them; by morning my hands feel fully moisturized. On my heels, when the season turns and they feel close to cracking, I do the same with body lotion, a plastic bag and a pair of bed socks over it. Those are habits of mine, not test results, but they follow the same logic as the studies: water first, then something that stops it leaving.

What should you avoid when combining them?

Avoid sealing irritants under an occlusive. A University of California review found that occlusion “often, but not always, increases percutaneous absorption of applied chemicals”, so a strong acid or retinoid layered under petrolatum may reach the skin in larger amounts than you expect. Keep the occlusive step for nights when the layers underneath are gentle.

Avoid relying on a humectant mist on its own through the day in a dry office. Based on how humectants pull water toward the surface, repeated misting with nothing on top can leave skin feeling tight again. If you mist, follow it with a cream, as we explain in our guide to misting before moisturizer.

Patch test a new rich product on a small area for a few days if your skin breaks out easily, since heavier textures are not right for everyone. If dryness comes with cracking, bleeding or persistent itching, a dermatologist can check whether it is more than winter dryness.

This article is for general cosmetic information and is not medical advice. If you have persistent dryness, irritation or a skin condition, speak with a dermatologist.