Ingredient review
Urease
INCI: UREASE
Urease is a natural enzyme that can gently exfoliate by breaking down urea, but its use in skincare is rare and may cause irritation if not carefully formulated.
In plain English
Urease is an enzyme found in plants and bacteria that speeds up the breakdown of urea into ammonia and carbon dioxide. In skincare, it's sometimes added to help remove dead skin cells or adjust the product's pH. However, because it can produce ammonia (which may be irritating), it's not a common ingredient and is used only in very small amounts in specialized formulations.
Review score
Safety, usefulness, and evidence
Useful in the right context, but not low-maintenance
The evidence base is still emerging, so marketing claims deserve extra caution.
Main practical flags: irritation is moderate; clogging risk is low.
- Source
- natural
- Evidence
- emerging
- Irritation
- moderate
- Clogging risk
- low
Quick decision guide
Read the cautions before using
Urease can be useful, but watch for some irritation potential.
Plain-English read
Treat this as a practical screening step before you compare products that contain this ingredient.
- Step 1Start with the score, then check the irritation and clogging risk before judging Urease.
- Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
- Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.
Score terms in plain English
Irritation risk
moderateCan bother some users, especially with frequent use, damaged skin, or strong companion ingredients.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
emergingThe ingredient may be promising, but claims should be treated more cautiously.
What it is
Urease is a naturally occurring enzyme that catalyzes the hydrolysis of urea into ammonia and carbon dioxide. It is sourced from plants (like jack beans) or microorganisms.
How it works
In a cosmetic product, urease reacts with urea (if present) to generate ammonia, which can raise the pH and provide a mild exfoliating effect by loosening dead skin cells. The reaction is highly specific and requires careful control to avoid skin irritation.
Pros
Gentle exfoliation
Urease offers a mild exfoliating action by breaking down urea, which can help smooth skin without harsh scrubbing.
Natural origin
Derived from plant or microbial sources, it appeals to those seeking naturally sourced skincare ingredients.
Cons and cautions
Irritation risk
The ammonia produced during the reaction can cause stinging, redness, or irritation, especially on sensitive or compromised skin.
Limited research
There is very little published research on urease's safety and efficacy in topical skincare, making it a less reliable choice.
Best for
- Those looking for a gentle, enzyme-based exfoliant
- People with normal to oily skin who tolerate low-pH products
Use caution if
- Individuals with very sensitive or reactive skin
- Anyone with a known allergy to enzymes or ammonia
Usage tips
Safety summary
Urease is considered safe in very low concentrations when properly formulated, but its potential to generate ammonia means it can cause irritation. There is limited safety data for long-term topical use.
Research notes
Research on urease in skincare is sparse. Most studies focus on its role in agriculture or medicine. The few cosmetic studies highlight its exfoliating potential but also note the need for careful pH control.
Common label clues
- Typical concentration
- Very low, typically under 0.1%
- Regulatory status
- Urease is not specifically regulated as a cosmetic ingredient in most regions, but it must comply with general safety requirements for cosmetic products.
- Common uses
- Exfoliating treatments, pH-balancing formulations
- Environmental note
- Urease sourced from plants like jack beans is renewable, but microbial production may have a lower environmental footprint.
Good to know
- Urease is more commonly used in agricultural and medical diagnostics than in cosmetics.
- The enzyme is highly specific to urea and will not work on other exfoliating ingredients.
Common questions
What is Urease in beauty products?
Urease is an enzyme found in plants and bacteria that speeds up the breakdown of urea into ammonia and carbon dioxide. In skincare, it's sometimes added to help remove dead skin cells or adjust the product's pH. However, because it can produce ammonia (which may be irritating), it's not a common ingredient and is used only in very small amounts in specialized formulations.
What does Urease do in a beauty product?
In a cosmetic product, urease reacts with urea (if present) to generate ammonia, which can raise the pH and provide a mild exfoliating effect by loosening dead skin cells. The reaction is highly specific and requires careful control to avoid skin irritation.
Is Urease safe for most people?
Urease is considered safe in very low concentrations when properly formulated, but its potential to generate ammonia means it can cause irritation. There is limited safety data for long-term topical use.
Who should be careful with Urease?
Individuals with very sensitive or reactive skin Anyone with a known allergy to enzymes or ammonia
Research sources
Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.