Hydroxyethyl urea is a synthetic humectant used in skincare and cosmetic products to draw moisture into the skin. It’s a small molecule (molecular weight of about 104) derived from urea, one of the skin’s own natural moisturizing factors. You’ll find it listed on ingredient labels for lotions, creams, and serums designed to hydrate dry or rough skin.
How It Differs From Regular Urea
Urea has been a staple in dermatology for decades. At higher concentrations (10% and above), it acts as a keratolytic, meaning it breaks down the bonds between dead skin cells and helps exfoliate thick, rough patches. That’s useful for conditions like severely cracked heels or keratosis pilaris, but it can sting sensitive skin or feel gritty in lighter formulations.
Hydroxyethyl urea keeps the moisture-attracting properties of urea while dropping the exfoliating action. Its chemical structure is urea with a small hydroxyethyl group attached (the formal name is 2-hydroxyethylurea). That modification makes it gentler. It doesn’t break down skin cells or lower the pH of a product the way high-concentration urea can. Instead, it focuses entirely on pulling water from the environment and deeper skin layers into the outermost layer of skin, the stratum corneum. This makes it well suited for everyday moisturizers rather than heavy-duty exfoliating treatments.
How It Works on Your Skin
Like other humectants (glycerin, hyaluronic acid, sorbitol), hydroxyethyl urea attracts and binds water molecules. Because it’s a relatively small molecule, it penetrates into the upper layers of the skin rather than just sitting on the surface. Once there, it helps the stratum corneum hold onto water it would otherwise lose through evaporation.
This mechanism makes a noticeable difference in how skin feels. In a clinical study that included hydroxyethyl urea as part of a moisturizing lotion, researchers measured a 131.75% increase in skin hydration over 45 days using a Corneometer, a device that precisely tracks moisture levels in the outer skin layer. The formulation also contained other hydrating and nourishing ingredients, so the result reflects a combined effect, but hydroxyethyl urea’s role as a humectant is a core part of why such formulations perform well.
For practical purposes, products containing hydroxyethyl urea tend to feel lightweight and non-greasy compared to those relying on heavier occlusives like petroleum jelly or mineral oil. It absorbs quickly and doesn’t leave the tacky film that high-molecular-weight hyaluronic acid sometimes does.
Where You’ll Find It
Hydroxyethyl urea shows up in a wide range of products: body lotions, facial moisturizers, hair conditioners, anti-aging serums, and hand creams. It’s particularly common in formulations marketed for dry or dehydrated skin because it boosts the overall moisture content without adding heaviness. You’ll also see it paired with other humectants and emollients to create a layered hydration effect, where the humectant pulls in water and an occlusive ingredient seals it in.
It works across a broad pH range, which makes it versatile for formulators. You can find it alongside alpha hydroxy acids in exfoliating products or alongside peptides in anti-aging creams without stability issues. It’s also compatible with both water-based and oil-in-water emulsion systems.
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel, an independent body that evaluates the safety of cosmetic ingredients, concluded that hydroxyethyl urea is safe in cosmetics at the concentrations currently used, provided the final product is formulated to be non-irritating. That assessment, published in the International Journal of Toxicology, reviewed available toxicology and clinical data before reaching its conclusion.
In the European Union, hydroxyethyl urea is registered under the REACH regulation (Registration, Evaluation, Authorisation and Restriction of Chemicals), which means it has gone through the EU’s chemical safety evaluation process. It is not restricted or banned in any major cosmetics market.
Skin irritation from hydroxyethyl urea alone is rare. Because it lacks the exfoliating properties of pure urea, it’s generally well tolerated even by people with sensitive or reactive skin. If you’ve had trouble with urea-based products stinging or causing redness in the past, hydroxyethyl urea is worth trying as a milder alternative that still delivers hydration.
Hydroxyethyl Urea vs. Other Humectants
- Glycerin: The most widely used humectant in skincare. Glycerin is effective and inexpensive but can feel sticky at higher concentrations. Hydroxyethyl urea provides a lighter, less tacky skin feel.
- Hyaluronic acid: A large molecule that holds up to 1,000 times its weight in water, but most of that action happens on the skin’s surface unless the product uses low-molecular-weight forms. Hydroxyethyl urea penetrates more easily due to its smaller size.
- Urea (standard): At low concentrations (2-5%), urea is a gentle humectant. At higher concentrations, it exfoliates. Hydroxyethyl urea delivers moisture without any keratolytic activity at any concentration.
- Sorbitol: Another small humectant, often used in combination with glycerin. Similar in feel to hydroxyethyl urea but less commonly featured as a star ingredient.
In practice, most well-formulated moisturizers combine several humectants rather than relying on one. Hydroxyethyl urea works well in these blends because it doesn’t interfere with other active ingredients and contributes a smooth, hydrated finish without residue.
Who Benefits Most
If your skin is dry, tight, or flaky but you find heavy creams uncomfortable or pore-clogging, products with hydroxyethyl urea offer a middle ground. The ingredient is especially useful for people who want the hydration benefits of urea-family chemistry without the tingling or peeling that can come with higher-concentration urea products. It’s a good fit for daily-use face moisturizers, body lotions for mildly dry skin, and leave-in hair conditioners where lightweight hydration matters more than deep exfoliation.