Ingredient review
Protease
INCI: Protease
Protease is an enzyme exfoliant that gently dissolves dead skin cells, but it can be irritating if left on too long or used too frequently.
In plain English
Protease is a type of enzyme that acts like tiny scissors to cut apart proteins. In skincare, it targets the protein bonds that hold dead skin cells together on the surface of your skin. This helps them slough off naturally, revealing smoother, brighter skin underneath. Unlike harsh physical scrubs, protease works gently without scrubbing, but it still needs to be used carefully to avoid over-exfoliation.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is useful, but some claims depend heavily on the formula.
Main practical flags: irritation is moderate; clogging risk is low.
- Source
- biotech
- Evidence
- moderate
- Irritation
- moderate
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Protease 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 Protease.
- 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
moderateThere is useful support, but formula details and claim strength still matter.
What it is
Protease is a naturally occurring enzyme (often derived from bacteria, fungi, or plants) that catalyzes the breakdown of proteins into smaller peptides or amino acids. In cosmetics, it is used as a gentle exfoliant to remove dead skin cells by digesting the keratin protein in the outer skin layer.
How it works
When applied to the skin, protease breaks down the protein-based 'glue' (desmosomes) that holds dead skin cells together. This loosens them so they can be rinsed away, promoting cell turnover and a smoother texture. It works best at a specific pH and temperature, so product formulation is key.
Pros
Gentle on skin
Protease exfoliates by dissolving dead skin cells without the need for abrasive particles, making it a good option for those with sensitive skin who still want exfoliation.
Improves texture
Regular use can smooth rough patches and enhance skin radiance by promoting natural cell turnover.
Cons and cautions
Irritation risk
If left on the skin too long or used too frequently, protease can cause redness, stinging, or peeling, especially for those with sensitive skin.
pH and stability sensitive
Protease requires a specific pH and temperature to work effectively, so product formulation matters. It may not be as stable as chemical exfoliants like AHAs.
Best for
- People with dull, rough skin looking for gentle exfoliation
- Those who prefer enzyme exfoliants over acids
Use caution if
- Individuals with active eczema, rosacea, or open wounds
- Anyone with a known allergy to enzymes
Usage tips
Safety summary
Protease is safe for cosmetic use when properly formulated and used as directed. Overuse or prolonged contact can cause skin irritation, especially in sensitive individuals. Patch testing is recommended before first use.
Research notes
Studies show that protease enzymes effectively exfoliate the skin by breaking down keratin, improving texture and brightness. However, most evidence comes from formulation studies rather than large-scale clinical trials.
Common label clues
- Typical concentration
- 0.1% to 1%
- Regulatory status
- Generally recognized as safe for cosmetic use in the EU and US when formulated within recommended concentrations and pH ranges.
- Common uses
- Exfoliating cleansers, Peeling masks, Serums
- Environmental note
- Protease is typically produced via fermentation using microorganisms, which is a relatively sustainable biotech process.
Good to know
- Protease is often listed as 'Protease' on ingredient labels, but may also appear as 'Bromelain' or 'Papain' if derived from pineapple or papaya.
- Enzyme exfoliants are generally considered milder than chemical exfoliants like glycolic acid, but they still require careful use.
Common questions
What is Protease in beauty products?
Protease is a type of enzyme that acts like tiny scissors to cut apart proteins. In skincare, it targets the protein bonds that hold dead skin cells together on the surface of your skin. This helps them slough off naturally, revealing smoother, brighter skin underneath. Unlike harsh physical scrubs, protease works gently without scrubbing, but it still needs to be used carefully to avoid over-exfoliation.
What does Protease do in a beauty product?
When applied to the skin, protease breaks down the protein-based 'glue' (desmosomes) that holds dead skin cells together. This loosens them so they can be rinsed away, promoting cell turnover and a smoother texture. It works best at a specific pH and temperature, so product formulation is key.
Is Protease safe for most people?
Protease is safe for cosmetic use when properly formulated and used as directed. Overuse or prolonged contact can cause skin irritation, especially in sensitive individuals. Patch testing is recommended before first use.
Who should be careful with Protease?
Individuals with active eczema, rosacea, or open wounds Anyone with a known allergy to enzymes
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.