Oats for the skin: benefits and how to use them

Oats are one of the few ingredients that tradition has used for centuries and that modern research has since confirmed, precisely identifying the molecules responsible. But they are also one of the ingredients surrounded by the most misconceptions: from the DIY mask made with breakfast oats to the question of gluten.

Article written by Elisa Avalle, founder of LeLang Skin Care and dermocosmetics specialist. Cover image generated with the support of artificial intelligence.

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What are oats in cosmetics?

The oats used in cosmetics are obtained from the seeds of Avena sativa, a cereal from the grass family. In INCI, it appears under different names depending on the part used and the extraction method, and this is the first thing to know when reading a label.

They are not interchangeable forms, but neither is one better than the others: solubility and texture vary, and so does the type of product they can be used in. The extract is what makes it possible to incorporate the active molecules into lightweight formulas and rinse-off products without leaving the roughness of a dispersed powder.

How oats work on the skin

Three groups of molecules are at work, each with a different role.

Avenanthramides are polyphenols found in very few other plants: they reduce the skin's response to irritating stimuli and provide antioxidant protection against free radicals.

Beta-glucans are polysaccharides that form a film on the surface and retain water, supporting the work of the skin barrier.

The starches provide the unmistakable velvety feel of oat products, which is not just a perception: it is a real reduction in friction on the surface.

What research says about oats

There is a study on oat beta-glucans that changed how this molecule is viewed. In a paper published in the International Journal of Cosmetic Science in 2005, Pillai, Redmond, and Röding demonstrated that oat beta-glucan penetrates into the epidermis and dermis despite its large molecular size - something that had previously been considered impossible.

In the same paper, a clinical study involving 27 subjects treated for eight weeks with a 0.5% beta-glucan solution found, through digital analysis of silicone replicas, a significant reduction in wrinkle depth and height and in overall roughness.

The sample is small, and that should be acknowledged. The study's main value lies in demonstrating penetration: it explains why oats are not just a surface-level ingredient.

A more recent study investigated the mechanism by which oat beta-glucan accelerates epidermal barrier recovery, promoting keratinocyte differentiation through the dectin-1 receptor. It is a laboratory study, not a clinical trial, but it provides a biological explanation for what is observed in use.

The sources can be consulted here: Pillai et al. study, barrier recovery study, review of beta-glucans in cosmetics.

What are oats used for in skincare?

Oats are used on dry skin and reactive skin, as well as for the itching sensation associated with dryness.

Their natural place is the body, and there is a clear logic behind this choice: the area to be treated is extensive, the skin generally receives less attention than facial skin, and a soothing product works to the extent that it is used consistently. A pleasant formula applied every day does more than a perfect formula that stays in the cabinet.

In rinse-off products, oats moderate the degreasing effect of surfactants; in body creams, they help with comfort and softness after cleansing.

Oats and gluten: what does the skin have to do with it?

It is the question people with celiac disease ask themselves when faced with an oat-based cosmetic, and that almost no one addresses.

Oats contain avenins, proteins from the prolamin family, related to the gluten in wheat, barley, and rye but structurally different. The issue of tolerance concerns ingestion, not application to the skin: celiac disease is an immune response triggered in the intestine.

That said, anyone with dermatitis herpetiformis — the skin manifestation associated with celiac disease — or who has received specific advice from their doctor may prefer to avoid oats in cosmetics as well. It is a precautionary choice worth respecting, and the treating physician remains the point of reference.

The case is different for people who are allergic to grasses: the reaction can also be topical, so it is advisable to test the product on a small area before regular use.

Does the DIY oat flake mask work?

The recipe is everywhere, and the honest answer is: it does something, but not what it promises.

Oat flakes ground at home are not cosmetic micronized flour. Three things change. The particle size, which is controlled in cosmetic flour but produces irregular and potentially abrasive particles at home. Sterility: a mixture of water and cereal at room temperature is an excellent culture medium and should be used immediately. And the concentration of active ingredients, which in a food product is neither known nor standardized.

On already reddened skin - which is the situation in which a mask is most often tried - rubbing irregular particles works against the goal. The traditional oat bath makes sense because it is highly diluted and involves no friction; a mask rubbed onto the face is something else.