Urea
Urea is part of the skin's own natural moisturizing factor, and at the low concentrations used in most skincare it hydrates the same way the skin naturally would. At higher concentrations it also has a mild keratolytic effect — softening rough, thickened skin — which is why it shows up in both moisturizers and dedicated foot/heel treatments at very different strengths.
How it works
An organic compound that serves as a cornerstone of the natural moisturizing factor (NMF), exhibiting unique hydrotropic and mild keratolytic properties. At low percentages, it unfolds intracellular proteins to maximize water-binding sites, clearing flaky scaling without thinning viable epidermis.
In practice, the concentration matters more than for most ingredients here — a facial moisturizer's low percentage hydrates gently, while a foot cream's much higher percentage is doing real exfoliation.
How to introduce it
Wait about 2 minutes before the next step. Judging Urea before week 4 means judging it before it's had time to actually work — most of what reads as "this isn't doing anything" in the first couple of weeks is just too early to tell.
- Apply to damp skin, then seal with moisturizer — on dry skin in low humidity it can pull water from the skin instead of the air.
Who should be careful
Urea is rated moderate risk. Patch test on your inner forearm 48 hours before first facial use, especially if your skin reacts easily to new products.
Questions people ask
A skin-identical hydrator that also softens rough, thickened patches at higher strengths — the same ingredient behind both facial moisturizers and heel creams, just at different concentrations.
Most people see a fair result around 4 weeks of consistent use — judging earlier usually means judging too soon.
Either — Urea works in both a morning and an evening routine.