Urea Cream for Cracked Heels: What the Comparisons Show

A heel cream labeled 40% urea can look like an obvious upgrade from one labeled 10% or 25%. The studies do not supply that simple ranking. The other ingredients, the condition of the skin and the comparison product all affect what a trial can tell you.

Start with the outcome you need: less roughness, a closed crack or complete healing of a deep fissure. Those are different measurements.

A 25% cream did not significantly outperform sorbolene

An Australian trial published in 2018 enrolled 41 people with simple foot dryness; 34 completed 28 days, including 19 using 25% urea cream and 15 using sorbolene. Participants applied their assigned moisturizer daily after showering. Participants and assessors were blinded.¹

The clinical score combined scaling, roughness, redness and fissures. Average improvement was 3.50 points with urea and 2.90 with sorbolene. Both groups improved, but the between-group difference was not statistically significant.¹

Recruitment fell short of the planned 44 participants. A small trial with a nonsignificant difference cannot establish that the creams are equivalent for everyone. It does, however, weaken a claim that the higher-priced urea formula must work better. The paper’s historical Australian prices are not current shopping prices.¹

Complete healing was a harder outcome in diabetes

A 2017 trial² at 19 centers in France and Belgium randomized 167 participants with diabetes and a deep, open heel fissure to a cream containing urea, glycerine and petrolatum or placebo for four weeks.²

Its primary outcome was complete healing of the selected fissure. That occurred in 46.3% with the test cream versus 33.3% with placebo. The difference did not reach statistical significance: P=.088.²

A separate outcome favored the cream: fewer participants still had a deep, open target fissure at four weeks, 6.4% versus 24.1%. Dryness and overall fissure measures also improved more.²

The favorable secondary findings should be reported alongside the missed primary outcome. “Improved cracks” and “proved complete healing” would describe this study differently. It tested a combination formula under a study protocol, rather than permission to treat a diabetic foot wound without assessment.

The latest review supports moisturizing, with limits

A September 2026 review included 12 randomized trials involving 603 participants with diabetes. It found that urea-containing creams improved dryness more than standard base creams after four weeks: a standardized mean difference of −0.36, with a 95% confidence interval from −0.55 to −0.17. The authors rated that comparison as high-certainty evidence.³

That number combines different dryness scales; it is not a percentage of cracks healed. Urea concentrations ranged from 5% to 25%, and accompanying ingredients varied. The analysis could not establish a concentration-response relationship or isolate urea’s contribution from the rest of each formula.³

The review excluded foot wounds and ulcers and called for studies of long-term outcomes such as ulcer prevention. A short-term dryness benefit cannot establish those outcomes. Nor does the pooled result prove that urea beats every other moisture-holding ingredient.³

The 40% comparison has reporting problems

A trial published in 2025 compared 40% urea with a cream described as a skin-barrier repair product. The full methods report 60 adults recruited and 48 completing four weeks; seven participants used one cream on each foot. Infection signs were exclusion criteria.⁴

The paper describes faster improvement with the comparison cream, but its statistical paragraph reports no significant between-product differences except an early functional limitation measure. Its description of the comparison formula is inconsistent: the introduction mentions 25% urea and lactic acid, while other passages emphasize different ingredients.⁴

SkinIntegra funded the research; the authors report that the funder had no role in its conduct or reporting. These details make it a poor basis for a broad claim that one branded product heals fissures faster, or that 40% urea is the preferred starting strength.⁴

Match ordinary heel care to the skin you have

For dry, cracked heels, the AAD⁵ advises a moisturizing cream containing 10% to 25% urea, an alpha hydroxy acid or salicylic acid, applied within five minutes of bathing. It also recommends plain petroleum jelly before bed and shoes that protect the heel, avoiding open-heeled or poorly fitting pairs. Severe cracks or skin that does not improve warrant a dermatologist’s assessment.⁵

That guidance offers a starting range. It does not identify a trial-proven best percentage for every heel. Check the whole formula and directions, especially if an acid-containing product stings or the crack is open.

With diabetes, the CDC⁶ advises daily inspection, moisturizer on the tops and bottoms of the feet, and none between the toes. It advises against removing corns or calluses yourself or using over-the-counter removers. Dry, cracked skin, reduced sensation, color or temperature changes, blisters and sores belong in a prompt foot-care assessment rather than waiting for the next appointment.⁶

Bring the tube and describe the location, depth, bleeding, discomfort and change over time. “This smooths the rough edge but the crack keeps opening” gives the clinician more to work with than the urea percentage alone.

Chapter 5, “Oily by Noon, Tight by Bedtime,” in Skin, Head to Toe explains the different jobs of moisturizer ingredients and uses the Shelf to organize a short routine. That framework helps separate a product’s ingredients from the specific result you need to assess.