Ingredients | Dry Skin
What Is Urea? The Quiet Skincare Powerhouse for Your Barrier
By Samantha Miller, Clinical Esthetician & Founder of The Naked Chemist | 30+ years clinical experience | Updated: June 2026
Your skin feels tight, looks dull, and no amount of moisturiser seems to fix it.
You layer on hyaluronic acid, you drink the water, and still those fine horizontal lines won’t soften.
Here’s the reassuring part: it’s rarely about doing more.
It’s usually about giving your skin back something it’s quietly losing as the years pass. Sound familiar?
That something is urea in skincare — one of cosmetic chemistry’s most effective moisturisers.
And one of the very few ingredients that hydrates and gently exfoliates at the same time.
It’s the quiet workhorse most people overlook. Let’s change that and look at what is urea.
So what is urea? It is a humectant and keratolytic that occurs naturally in your skin’s moisturising factor (NMF). At low concentrations (under 10%), it draws in water and strengthens the barrier; at higher concentrations (10% and above), it dissolves dead skin and exfoliates. This dual action makes it uniquely effective for dry, dehydrated, rough and scaly skin — and it’s one of the only ingredients that moisturises and exfoliates at once.
In This Article
Key Takeaways
- Urea is a natural part of your skin’s moisturising factor — and your levels drop as you age.
- Below 10%, it hydrates and repairs the barrier; above 10%, it exfoliates dead, scaly skin.
- It’s one of the very few ingredients that moisturises and exfoliates simultaneously.
- Low percentages (2–5%) are gentle enough for sensitive, reactive and acne-prone skin.
- Research links urea to improved barrier function, reduced water loss, and improved dry skin conditions.
- The cosmetic version is lab-made and vegan — never animal-derived.
- Pairing urea with lactic acid, glycerin and sodium PCA mirrors healthy skin’s own chemistry.
What Is Urea in Skincare?
Urea, also called carbamide, is a hygroscopic (water-loving) molecule that forms part of your skin’s natural moisturising factor. It attracts and holds water in the stratum corneum and, at higher concentrations, breaks down the keratin bonds that trap dead cells. In cosmetics, it’s used in two main forms: urea itself and its gentle humectant cousin, hydroxyethyl urea.
Think of urea as a workhorse, not a buzzword. It’s been used in dermatology for decades, and a 2021 review in Dermatology and Therapy confirms it improves both hydration and skin barrier function — which is exactly why it turns up in everything from delicate face creams to heavy-duty heel balms.
Your NMF is a precise little cocktail: roughly 40% amino acids, 12% sodium PCA, 9% glycerol and around 8.5% urea, among other water-binding substances. Together they keep your outer layer hydrated, flexible and intact.
Here’s the catch. Like collagen and so many of skin’s good things, your natural urea declines with age. Less urea means lower water-binding capacity — and that’s when skin starts to feel tight, rough and prone to flaking.
A Quick History: From Lab Curiosity to Skincare Hero
What is urea? Well, it holds a genuine place in the history of science. In 1828, chemist Friedrich Wöhler synthesised it in his Berlin lab — making it the first organic molecule ever created from inorganic materials. That single experiment helped launch modern organic chemistry. Not bad for a humble moisturiser.
As far back as the 1950s, the legendary dermatologist Albert Kligman — the man who co-invented Retin-A — called urea a forgotten therapy worth rediscovering.
“It sometimes happens in the enthusiastic search for new therapeutic agents that some old stand-by has been overlooked, whose lustre has worn off, but which may nonetheless have some useful application in moments when the miracle drugs falter. In the world of topical therapy, urea is such a drug.”
— Dr Albert Kligman, co-inventor of Retin-A
Is Urea in Skincare Made From Urine?
No — and this is the myth that puts people off. While urea naturally occurs in urine, the urea in your skincare is synthetic, lab-made from ammonia and carbon dioxide, and entirely vegan. There is nothing animal-derived in a well-formulated urea product. The internet loves a gross-out story, but the chemistry tells a calmer truth.
How Does Urea Actually Work on the Skin?
Urea works on two levels at once. On the surface, it binds water and slows moisture loss like any good humectant. But deeper down, it influences gene expression in skin cells — boosting filaggrin, supporting the lipid barrier, and helping regulate skin renewal.
This is the part most people miss. Most moisturisers sit on the skin’s surface and offer a temporary fix. Urea is different — it actually changes how your skin behaves.
As I’ve explained before, emollients and occlusives coat the skin’s surface for instant comfort, but they don’t improve your skin’s ability to retain water. Urea penetrates the stratum corneum, absorbs and retains water there, and increases your skin’s own capacity to stay hydrated.
How? Researchers believe urea breaks hydrogen bonds in the stratum corneum, loosens epidermal keratin and creates more water-binding sites. It’s effectively rewiring your skin to hold onto moisture better.
The Filaggrin Connection
Applied topically, urea boosts filaggrin — a protein essential to hydration and a strong barrier. A weak filaggrin supply leads to greater water loss, increased sensitivity, and more flare-ups. A 2021 dermatological review described urea as a small molecule that regulates keratinocyte differentiation, lipid synthesis and antimicrobial peptide production. In plain English: it helps skin renew properly, build its barrier and defend itself.
The Benefits of Urea for Skin
Urea hydrates, repairs the skin barrier, gently exfoliates, reduces irritation, and helps other ingredients absorb better. Few single ingredients deliver this many benefits at once, which is why dermatologists reach for it across dry, rough, itchy and compromised skin.
1. It Deeply Hydrates Dehydrated Skin
Urea is water-loving. It binds water molecules and pulls them into the skin, keeping it plump and supple. Unlike occlusives that seal the surface, urea improves your skin’s ability to retain moisture, which is why the results last rather than fading by lunchtime.
2. It Repairs a Damaged Barrier
By boosting filaggrin and supporting lipid production, urea helps rebuild the barrier that keeps water in and irritants out. There’s even research showing it reduced skin’s susceptibility to harsh sodium lauryl sulfate (SLS) after just three applications — a small but telling sign of how quickly it strengthens skin’s defences.
3. It Exfoliates Without Acids
When considering what urea is, you should know that at higher concentrations, urea becomes keratolytic, dissolving the bonds between dead skin cells so they shed naturally. This is gold for anyone whose skin can’t tolerate AHAs or scrubs — you get a smoother texture without the sting, and moisture can finally reach the fresh skin underneath.
4. It Calms Itching and Irritation
Urea has soothing, anti-itch properties, which is why it appears in so many creams for eczema and very dry, reactive skin. A 2025 study found that a 10% urea lotion used for four weeks improved both dryness and itching in age-related xerosis.
5. It Helps Other Ingredients Work Harder
Urea is a penetration enhancer. It helps actives like antioxidants, vitamins and even prescription treatments absorb more effectively. A 2019 review found that topical urea improved the effectiveness of antifungal nail treatments precisely because it helped them penetrate the nail.
Recommended: Quench Plumping Peptide Gel
A lightweight, barrier-supporting gel that pairs urea with glycerin, hyaluronic acid and sodium PCA — the same hydrating molecules your skin makes naturally. It works at a cellular level rather than just sitting on top.
Best for: dehydrated, dull, tight or fine-line-prone skin.
Can Urea Help Acne and Fungal Acne?
There’s no official research on urea curing acne, but the evidence is promising. Urea supports the antimicrobial peptide LL-37, which targets acne-causing bacteria in lab studies, and two in-vitro studies show it inhibits Malassezia, the yeast linked to fungal acne. Its gentle exfoliation also stops dead skin buildup from clogging pores.
Here’s the part most people miss: low-percentage urea (around 2–5%) can be a quiet hero for sensitive, breakout-prone skin that can’t handle stronger actives. It keeps pores clear without triggering the inflammation that scrubs and acids so often cause.
In my 30 years in the clinic, I’ve watched reactive, acne-prone clients fail with everything aggressive — then settle beautifully on a low-urea routine. Calmer skin almost always clears faster than punished skin. That’s the barrier-first principle in action.
Recommended: Clarify pH Balancing Gel
A lightweight, pH-balancing gel that keeps pores clear and skin calm without stripping the barrier — ideal alongside low-percentage urea for breakout-prone skin that can’t tolerate harsh actives.
Best for: oily, congested or breakout-prone skin.
What Skin Conditions Can Urea Treat?
Urea is used for a wide range of dry, scaly skin conditions, including eczema (atopic dermatitis), psoriasis, ichthyosis, xerosis, seborrheic dermatitis, keratosis pilaris, and nail fungus. Its combination of hydration and gentle exfoliation makes it valuable wherever skin is dry, rough or thickened.
The research here is genuinely striking. In psoriasis-affected skin, natural urea levels are reduced by around 40% compared with healthy skin. In eczema, they can be reduced by up to 85%. When you replenish what skin has lost, it makes sense that conditions driven by dryness and barrier damage improve.
A 2017 systematic review on creams for dry, cracked feet found urea was the most commonly included ingredient — a quiet vote of confidence from the formulators who do this for a living.
What Percentage of Urea Should You Use?
Concentration is everything with urea. Under 10% hydrates and is suitable for daily facial use; 10–20% smooths rough body skin; 20–30% reduces itching and tackles thick, scaly areas; and 40% is proteolytic, reserved for dystrophic nails and severe calluses. Higher is not better — it’s just different.
The Urea Concentration Scale
From hydration to exfoliation — what changes as the percentage climbs
0%3%10%20%40%
Under 3%
Gentle hydration for sensitive, reactive skin.
3–10%
Daily moisture & barrier support. Ideal for the face.
10–20%
Smooths rough patches & keratosis pilaris on the body.
20–40%
Strong keratolytic for heels, calluses & dystrophic nails only.
Below 10% urea mainly hydrates • at 10% and above it starts to exfoliate
| Concentration | Main Action | Best For |
|---|---|---|
| Under 3% | Humectant (hydrates) | Sensitive, reactive skin |
| 3–10% | Hydrates & supports barrier | Daily facial use |
| 10–20% | Mild keratolytic (exfoliates) | Rough body skin, keratosis pilaris |
| 20–30% | Strong keratolytic, anti-itch | Thick, scaly or itchy areas |
| 40% | Proteolytic (breaks down protein) | Dystrophic nails, heels, calluses |
On the face, stay low. High-percentage urea can sting, feel tacky and overwhelm delicate facial skin — it belongs on elbows, knees and heels, not your cheeks. Always choose a product formulated specifically for the face rather than borrowing a foot cream.
Hydroxyethyl Urea vs Urea: Are They the Same?
When considering what urea is, you need to understand that there are three “ureas” on ingredient labels, and they are completely different. Hydroxyethyl urea is a gentle humectant. Diazolidinyl urea and imidazolidinyl urea are preservatives — not moisturisers — and they’re known to release formaldehyde.
This trips up a lot of people, so let’s make it simple.
Hydroxyethyl urea (INCI name) is the safe, water-binding humectant you actually want for hydration.
Diazolidinyl and imidazolidinyl urea are antimicrobial preservatives that protect products from bacteria and mould.
Useful, but a different job entirely, and one some people choose to avoid because they release small amounts of formaldehyde.
So if you see “urea” near the top of an ingredient list, it’s likely doing the hydrating work. If you see the longer preservative names near the bottom, that’s the preservative system: same word, very different roles.
Common Mistakes That Are Damaging Your Skin
Most urea mistakes come down to using too high a strength on too-delicate skin, or stacking it on top of other exfoliants. The result is the opposite of what you wanted — a stripped, inflamed, exhausted barrier.
Going too strong, too soon. A 15–20% formula on facial skin is a fast track to redness and tiny bumps. Start low and let urea do its slow, steady work. One of our readers tried a 15% peel, washed it off after five minutes because it stung, and only found relief when she dropped to 2%.
Layering urea over acids and scrubs. This is classic skin exhaustion — over-treated skin that never gets the chance to recover. If your barrier is already struggling, piling on actives makes it worse, not better.
Using a body or foot cream on your face. Those higher concentrations are formulated for thick skin. On the face, they can irritate. Match the product to the area.
Expecting overnight miracles. Urea rewards consistency. Give it a few weeks of steady use before you judge it — most of the research showing real improvement runs over four weeks or more.
Real Results: What Urea Did for These Readers
What is urea? Well, the science is certainly one thing. Watching it work on real skin, at real percentages, is another. Here are a few experiences from our readers and clients.
“After reading your article, I tried a cream with 10% urea. My skin had become thick and dull, no matter how much I exfoliated. It works exceptionally well — thank you for raising awareness.”
— Jane, London
Jane was dealing with hyperkeratinisation, where dead skin cells don’t shed properly and build up into a thick, dull layer. A higher-percentage urea cream acts as a keratolytic emollient, slowly dissolving that buildup and softening the texture.
“I started using your humectant with urea twice daily, sealing it with my moisturiser. My skin feels hydrated and smooth, no longer rough to touch, with a lovely luminous glow.”
— Kathy, Auckland
Kathy pairs a urea-rich gel with a sealing moisturiser twice daily — the combination of skin-identical hydrators (urea, glycerin, hyaluronic acid, sodium PCA) under an occlusive is a textbook way to lock in results.
“I tried 15% urea, but it was too irritating. At 5–6%, I still got small red bumps. At 2% it’s hydrating and has almost cleared my acne — and my skin can’t tolerate AHAs or scrubs, so urea is a godsend.”
— John, Texas
John’s story is the perfect illustration of why percentage matters. The same ingredient that irritated at 15% became a gentle, pore-clearing hero at 2% — likely thanks to urea’s link to the bacteria-fighting peptide LL-37.
“My skin was always dehydrated with lines appearing, and no amount of hyaluronic acid helped. After a week with your Quench gel and Immortelle moisturiser, my dull, flat skin is positively glowing.”
— Lorrie, Brisbane
Lorrie’s earlier moisturisers were sitting on top of the skin. Combining urea with other NMF components enables it to work at the cellular level, which is exactly the difference between surface comfort and real hydration.
Is Urea Safe? Side Effects and Precautions
When thinking about what urea is, you should know that it is considered one of the safer, better-tolerated ingredients in skincare. Most people experience no side effects, though high concentrations may occasionally cause stinging, redness or irritation. Avoid the eyes and lips, patch-test if sensitive, and consult a doctor if pregnant or breastfeeding.
Decades of dermatological use back up urea’s gentle reputation. That said, a little care goes a long way.
If you have sensitive skin, start with a low percentage and patch-test on your inner arm first. Keep urea away from the delicate eye and lip area, where it’s more likely to sting. And because the effects of urea during pregnancy haven’t been fully studied, it’s best to check with your doctor or dermatologist before using it if you’re pregnant or breastfeeding.
Founder Insight
Samantha Miller — Clinical Esthetician & Founder of The Naked Chemist
“After 30 years working with skin, I’ve learned that the best ingredients are rarely the loudest. Urea isn’t glamorous — but it works with your skin instead of against it. Most skincare treats symptoms. Urea helps rebuild the skin itself. If I could give one piece of advice, it would be to stop fighting your skin and start supporting it.”
If your skin feels tight, dull or perpetually thirsty, it isn’t asking for more layers — it’s asking for the building blocks it’s quietly lost over the years. Urea is one of the most important of those.
Everything we formulate at The Naked Chemist starts with the barrier first. That’s why we pair urea with the very molecules your skin already recognises — glycerin, hyaluronic acid and sodium PCA — so it works at a cellular level rather than just resting on the surface.
If you want a calm, considered place to begin, our hydrating range is built around exactly this philosophy.
To conclude. The Naked Truth
So, what is urea, and why does it deserve a place in your routine? Here’s what three decades of working with skin have taught me: the ingredients that quietly rebuild almost always outperform the ones that loudly strip. Urea is the perfect example. It isn’t a trend or a miracle — it’s something your skin already makes and slowly loses with age, and giving it back is one of the simplest, most intelligent things you can do for dry, tired, dehydrated skin.
We’ve covered a lot of ground. You now know that urea is a natural part of your skin’s moisturising factor, that it works on two levels at once — binding water at the surface while boosting filaggrin and barrier function deeper down — and that concentration is everything.
Below 10%, it hydrates and supports sensitive, reactive, and breakout-prone skin; above 10%, it becomes a keratolytic that smooths rough, scaly texture; and at the highest strengths, it’s reserved for thick skin, heels, and stubborn nails. You also know the myth doesn’t hold up: the urea in your skincare is lab-made and vegan, never animal-derived.
Most importantly, you know how to use it well. Start low for the face, stay consistent, avoid stacking it on top of harsh acids and scrubs, and give it a few weeks to do its quiet work. That’s the difference between skin that’s constantly over-treated and exhausted, and skin that finally has what it needs to repair itself. The research backs it up, and so do the readers who’ve felt rough, dull, dehydrated skin turn soft and luminous again.
It earns its place because it does what almost nothing else can: hydrate and gently exfoliate simultaneously while strengthening the barrier that holds everything together. That’s the whole barrier-first philosophy distilled into a single ingredient — not more products, not more layers, just giving your skin back the building blocks it’s quietly lost.
Frequently Asked Questions
What is urea, and is it safe to use on your face every day?
Yes — at low concentrations (under 10%), urea is gentle enough for daily facial use and is well tolerated by most skin types, including sensitive skin. Choose a product specifically formulated for the face, as higher-strength body and foot creams can irritate delicate facial skin.
Does urea exfoliate or moisturise?
Both, depending on the concentration. Below 10%, it acts primarily as a humectant that hydrates and supports the skin barrier; at 10% and above, it becomes keratolytic, exfoliating dead skin. This dual action is what makes it so unusual.
What’s the difference between hyaluronic acid and urea?
Both are humectants that draw water into the skin and occur naturally in healthy skin. The difference is what they are: urea is a small molecule from protein breakdown that also exfoliates and enhances penetration, while hyaluronic acid is a large sugar-based molecule that mainly holds water. They work beautifully together.
Does urea make your skin peel?
What is urea? At high concentrations, it can. Because urea is keratolytic at 10% and above, strong formulas designed for thick or calloused skin may cause visible peeling. At the low percentages used for the face, it exfoliates gently without obvious peeling.
Is the urea in skincare made from urine?
No. The urea used in cosmetics is synthetic, made in a lab from ammonia and carbon dioxide, and is vegan-friendly. Modern skincare contains no animal- or human-derived urine.
Who should avoid urea?
Anyone who experiences persistent redness, itching, stinging, or burning should stop using it. Those who are pregnant or breastfeeding should check with a healthcare professional first, as urea’s effects in these situations haven’t been fully studied.
Is urea an AHA?
A: No. Urea is not an AHA (alpha hydroxy acid). It is a humectant and, at higher concentrations, a keratolytic — meaning it exfoliates by dissolving the bonds between dead skin cells rather than by lowering skin pH the way AHAs like glycolic or lactic acid do. This is why urea exfoliates gently, without the sting many people get from acids.
References
- Piquero-Casals J, Morgado-Carrasco D, Granger C, et al. Urea in Dermatology: A Review of its Emollient, Moisturising, Keratolytic, Skin Barrier Enhancing and Antimicrobial Properties. Dermatology and Therapy (Heidelb). 2021;11(6):1905–1915. https://pmc.ncbi.nlm.nih.gov/articles/PMC8611129
- Grether-Beck S, Felsner I, Brenden H, et al. Urea Uptake Enhances Barrier Function and Antimicrobial Defence in Humans by Regulating Epidermal Gene Expression. Journal of Investigative Dermatology. (NIH/PMC.) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3352965/
- Effect of Topical Treatment with Urea in Ichthyosis, Atopic Dermatitis, Psoriasis, and Other Skin Conditions — A Systematic Review. PubMed. 2025. https://pubmed.ncbi.nlm.nih.gov/40109645/
332 replies on “What Is Urea? The Quiet Skincare Powerhouse for Your Barrier”
Hi there! How are you?
Could you please tell me if this composition and ingredients list of a hydration cream for skin is safe to use life long and won’t cause any diseases?
Composition:
Each gram contains:
Propylene Glycol IP 15mg
Diazolidinyl Urea (Preservative) 1.5 mg
in a cream base
List of ingredients:
Lecithin, magnesium aluminum silicate,
carbomer 934P, glycerin, sodium hydroxide,
capric acid triglyceride, dimethicone,
squalene, poloxyl 40 stearate, stearic acid,
glycol stearate, glyceryl stearate, cetyl alcohol,
myristyl myristate, C-10-30 carboxylic acid
sterol ester, butylated hydroxy anisole,
toluene, water, EDTA
TIA,
Priyasha
Hi Priyasha thank you for reaching out, but sadly we don’t offer formulation advice on products Samantha
Is Diazolidinyl Urea (Preservative) 1.5 mg safe to use life long?
Hi Priyasha there is no research to suggest otherwise.
Is 10 percent urea safe to use on face ?
Hi Amina, we get good results with 1%, I recommend starting there and slowly moving up -the higher you get the more exfoliating urea becomes.
Would urea work to soften/moisturize hair aswell?
Hi Annie, sadly hair care products is not our field of expertise, apologies for not being more help Samantha
Hi Samantha, very interesting article,
Do you think Urea would be beneficial in breaking down hyper pigmentation on the skin? And if so what percentage do you think would be required (for face).
Many thanks
Hi, Alison, I have known it to lighten hyper-pigmentation but not a huge amount. you just have to be careful on the skin because if you are working in high percentages it can become irritating. It’s trial and error I am afraid. Samantha
Amazing article!
I have a few questions:
1: Which of your products contain urea and what percent do they have?
2: Is a 5% urea cream safe to use along with AHA’s?
3; is urea more effective in a toner/serum or a thicker cream? Like would it be better suited in the beginning of your routine or one of the last steps?
4: should you start at a lower percentage and work your way up to 5% or maybe 10% urea on your face?
Thank you
Hi Justin
Thank you for that feedback. In answer to your questions:
H20 and urea contain urea
Urea is a keratolytic as is lactic acid, if you have thick, leathery mature skin that is in serious need of exfoliation then yes, but it should be a skin type that presents no underlying sensitivity. otherwise, avoid this combination for the face.
Urea in my opinion is more effective in a cream base, esp[ecially for areas of toughened skin lie the feet.
As with everything we are all metabolically different, so it’s all about trial and error, my advice is to start low and build up over time.
I hope this helps
Samantha
thanks for your reply!! after reading your article, i added a 5% urea cream to my skincare routine for my face. I also use a 10% mandelic acid gel every 3 days and this combination has helped my skin a lot! I don’t think I’d ever try anything higher than 5% on my face, the next step up is usually 10% and I believe it would be too harsh. Thanks so much for your informative articles and advice
Hi Justin That is no problem, what skin conditions did you get results with can you give us more feedback for my readers please? Thank you in advance Samantha
It has mainly helped my dry skin and made it much smoother to the touch and less tight
Is it safe to use 40% urea on constantly dry and peeling lips?
Hi Theresa
We certainly dont formulate at this level but its very very strong, even at a small percentage you are going to get keratolytic effect.
Hi Samantha – I have read that urea can help prevent/treat ingrown toenails. Do you have a product for that?
Hi Lilly I have not heard that, we only sell quench at high strength, not a specific toe nail product? Samantha
Thank you for this! Do you have an idea of how urea might affect the hair? I would like to try a cream with 5% or 10% urea on my scalp (they have done wonders for my skin), but I would rather avoid damaging my hair if I can.
I’m sorry no Haircare is not our domain, apologies. Samantha
Hi there!
Is urea safe during pregnancy and breastfeeding?
Hi Sara
Absolutely it is safe but like everything its all about the percentage you are using within your formula…
Hello, great questions and enlightening responses thanks except not asked is can UREA be safely used for genital and anal eczema itches?
Hi Stephanie thank you for the great feedback, this sadly is not an area or condition I have treated so I would not be confident in advising you I apologise. Good luck Samantha