Urea
Also known as: Carbamide
Key Takeaways
- Urea is a naturally occurring humectant and keratolytic found in healthy skin -- it hydrates at low concentrations and gently dissolves excess keratin at higher concentrations
- For the face, 2-5% is standard; for rough body skin and keratosis pilaris, 10-25% is more effective
- It pairs particularly well with ceramides and hyaluronic acid to reinforce the barrier alongside deep hydration
- High concentrations may sting on broken or inflamed skin -- start low and increase concentration as the barrier heals
A naturally occurring humectant and keratolytic agent found in healthy skin that attracts moisture, softens keratin, and at higher concentrations gently exfoliates rough or thickened skin. An underrated workhorse for dry skin conditions, keratosis pilaris, and cracked heels.
Skin Type Compatibility
Skin Tone Notes
Effective across the Fitzpatrick scale. Gentle exfoliation at higher concentrations may help with texture-related concerns regardless of skin tone.
What It Does
At low concentrations (2-10%), urea acts as a humectant that draws water into the stratum corneum and improves the skin's natural moisturization factor (NMF). It also softens keratin by breaking hydrogen bonds in the protein structure, improving the texture of rough, thickened skin. At higher concentrations (10-40%), the keratolytic effect dominates, making it effective for conditions like keratosis pilaris, calluses, and hyperkeratotic eczema where excess keratin buildup needs to be dissolved.
Concerns Addressed
How To Use
For the face, apply a 2-5% urea moisturizer after cleansing, AM or PM. For body use on rough areas like elbows, knees, or heels, concentrations of 10-25% are effective and can be applied nightly. For keratosis pilaris on the arms or legs, 10% urea is a well-supported starting point. Higher concentrations (30-40%) for calluses and very thickened skin are best used under occlusion or guidance from a dermatologist.
Pairs Well With
Ceramides
Lipids that naturally comprise roughly 50% of the skin's outer barrier. Topical ceramides replenish depleted barrier lipids, restore moisture retention, and reduce sensitivity and irritation. The most foundational ingredient category for barrier health and repair.
Hyaluronic Acid
A naturally occurring polysaccharide that can hold up to 1000 times its weight in water. Hyaluronic acid is one of the most effective and universally tolerated hydrating ingredients in skincare, working for every skin type and pairing seamlessly with virtually all actives.
Side Effects
Low concentrations are very well tolerated. Higher concentrations (above 10%) can cause stinging or burning on broken, cracked, or inflamed skin. This sensation is temporary and typically resolves as the skin heals. Start with lower concentrations if your skin barrier is compromised. Avoid applying high-concentration urea directly to open wounds.
Key Studies
Topical urea significantly increased stratum corneum hydration and improved the skin barrier function in participants with dry skin, with effects measurable after two weeks of consistent use.
A 10% urea cream applied twice daily for 8 weeks significantly reduced the roughness, follicular papules, and texture irregularities associated with keratosis pilaris compared to a non-urea moisturizer.
What Is Urea?
Urea is an endogenous compound naturally produced by the body and found in the stratum corneum as part of the skin’s natural moisturizing factor (NMF). It plays a fundamental role in keeping the outer skin layer hydrated and flexible. When the skin is dry, damaged, or affected by conditions like eczema or keratosis pilaris, urea levels in the stratum corneum are often depleted, making topical urea a logical and physiologically appropriate way to restore moisture and improve barrier function.
How Does Urea Work?
Urea’s mechanism shifts depending on concentration. At 2-10%, it primarily functions as a humectant, binding water molecules within the stratum corneum and improving the skin’s capacity to retain moisture. It also loosens the cohesion between corneocytes (dead skin cells), improving desquamation and surface texture without the aggressive exfoliation associated with AHAs. At concentrations above 10%, the keratolytic action becomes pronounced, disrupting keratin protein bonds and softening thickened, hyperkeratotic skin tissue.
Who Should Use Urea?
Anyone with persistently dry skin, rough body texture, keratosis pilaris, eczema, or cracked heels stands to benefit meaningfully from urea. It is also a strong supporting ingredient in barrier-repair routines for sensitive or compromised skin when used at appropriate concentrations. Its combination of hydration and gentle exfoliation makes it particularly effective for body skin where other actives are rarely applied.
Frequently Asked Questions
What concentration of urea should I use?
It depends on your goal. For general facial hydration and barrier support, 2-5% is well tolerated by most skin types and provides meaningful moisturization. For rough body skin and mild texture concerns like early keratosis pilaris, 10% is the standard starting point. For calluses, severely thickened heels, or more advanced keratosis pilaris, 20-25% body lotions are widely available. Concentrations above 30% are primarily clinical and best used under professional guidance.
Does urea smell bad?
Pure urea in solution can have a faint ammonia-like odor, but well-formulated skincare products contain urea at concentrations and with buffering agents that make any odor undetectable. If a product has an unpleasant smell, it is more likely related to other ingredients or degradation than to the urea itself. Most reputable urea creams and lotions are fragrance-acceptable.
Is urea safe for eczema-prone skin?
Yes, and it is frequently recommended for eczema management. Urea is one of the components of the skin's natural moisturizing factor, so topical application helps restore what eczema-prone skin tends to lack. Low concentrations (2-5%) hydrate and support the barrier without risk of irritation. Higher concentrations can sting on actively inflamed or broken skin, so apply them to resolved areas rather than active flares. A dermatologist may recommend specific concentrations depending on the severity and location of your eczema.