Skin Conditioning Ingredients

"Skin conditioning" is an official cosmetic function category defined in the EU CosIng database, used to describe ingredients included in a formulation to help skin look and feel smoother, softer or more supple. It isn't a single ingredient but a broad functional category that covers a wide range of natural and synthetic materials found across moisturisers, cleansers, serums, sunscreens and body care products.

Within this category, ingredients are generally grouped into a few recognised sub-types: emollients, which help soften and smooth the skin's surface; humectants, which attract and hold moisture; occlusives, which form a barrier on the skin to reduce water loss; and a broader group of miscellaneous skin-conditioning agents that don't fit neatly into the other three but still support how skin looks and feels.

Emollients such as squalane or caprylic/capric triglyceride work by filling in the tiny gaps between skin cells, smoothing the surface and reducing the feeling of roughness. Humectants, including glycerin and sodium hyaluronate, draw water from the deeper layers of skin and, in humid conditions, from the surrounding air, helping the skin's surface feel more hydrated. Occlusive ingredients, such as petrolatum, shea butter or dimethicone, sit on top of the skin to slow water loss through evaporation, which is particularly useful for very dry or compromised-feeling skin.

Most well-formulated moisturisers combine ingredients from more than one of these sub-types, since each works through a different mechanism to support the skin's surface.

Key points

• Emollients (e.g. squalane, caprylic/capric triglyceride) help smooth and soften the skin's texture.
• Humectants (e.g. glycerin, sodium hyaluronate) attract and hold moisture at the skin's surface.
• Occlusives (e.g. petrolatum, dimethicone, shea butter) help reduce water loss from skin.
• Miscellaneous conditioning agents (e.g. panthenol) support overall skin feel without fitting a single sub-type.
• Used across virtually all skincare categories, from cleansers to sunscreens to serums.

What's the difference between an emollient, a humectant and an occlusive?

Emollients smooth and soften the skin's texture by filling gaps between skin cells. Humectants, such as glycerin, attract water to the skin's surface. Occlusives, such as petrolatum or dimethicone, form a layer that helps reduce water loss. Most moisturisers use a combination of all three to support the skin's overall appearance and feel.

Do oily skin types need skin-conditioning ingredients too?

Yes, though the type matters. Very oily or breakout-prone skin generally benefits more from lightweight humectants, such as hyaluronic or polyglutamic acid, rather than heavier occlusive ingredients like petrolatum or dense butters, which can feel too rich. All skin types benefit from some degree of skin conditioning within a well-formulated product.