evidently.
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Urea

UREA

Dermatology's oldest moisturizer that actually treats — a natural moisturizing factor with decades of trial receipts.

antistaticbufferinghumectantskin conditioningCAS 57-13-6

Why it works

Urea is part of the skin's own natural moisturizing factor: it binds water inside corneocytes, and at higher strengths loosens the bonds between dead cells (keratolysis). Below ~10% it hydrates and repairs barrier function; above that it progressively exfoliates — which is why 10%+ creams belong on feet and rough patches, not the face.

Concentration matters

Face products typically use 2–10%. 5% is a sweet spot for dry facial skin; 10%+ is for body keratosis and can sting on the face.

The evidence, by concern

Dryness

Strong evidence

Decades of randomized trials in dry-skin conditions

How sure are we
strong
How much it helps
modest but real
Do studies agree
strongly agree

Urea creams (5–10%) beat both vehicle and plain moisturizers for xerosis in multiple randomized trials, including in eczema-prone and diabetic skin, improving hydration and reducing relapse. Among moisturizer ingredients, its evidence base is rivaled only by petrolatum-class occlusives.

The receipts

10 trials/reviews indexed · showing most cited

Safety, without the fear

Anchored to regulatory assessments — not hazard lists. Dose makes the poison; these are the conclusions at real-world cosmetic use.

CIR · Cosmetic Ingredient Review

CIR concluded urea is safe as used in cosmetics; transient stinging on compromised skin is the main tolerability note, rising with concentration.

Source →
Spotted an error, or a study we missed? Claims were fact-checked against the cited literature in August 2026; independent clinical sign-off is pending — corrections welcome.