Ingredient review
Aminopeptidase
INCI: Aminopeptidase
Aminopeptidase is a gentle enzyme exfoliant that helps smooth skin by breaking down dead surface proteins, but it is less common and less studied than other exfoliating enzymes.
In plain English
Aminopeptidase is an enzyme that acts like tiny scissors, cutting apart protein fragments on your skin's surface. This helps loosen and remove dead skin cells, revealing a smoother, brighter complexion. Unlike harsh scrubs, it works gently without rubbing, making it suitable for sensitive skin. It's often used in serums or masks for mild exfoliation.
Quick decision guide
Useful, but context matters
Aminopeptidase is generally a lower-concern ingredient when the full formula suits your skin.
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 Aminopeptidase.
- 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
lowLess likely to sting, burn, or bother most users, though sensitive skin can still react.
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
Aminopeptidase is a type of enzyme (a protein that speeds up chemical reactions) that specifically targets and breaks down peptide bonds at the ends of protein chains. In skincare, it is produced via biotechnology and used as a gentle exfoliant.
How it works
When applied to the skin, aminopeptidase cleaves the bonds between amino acids in the proteins that hold dead skin cells together. This loosens the outer layer of the stratum corneum (the skin's topmost barrier), allowing dead cells to shed naturally. This process is called enzymatic exfoliation and is much milder than physical or acid exfoliation.
Pros
Very gentle exfoliation
Aminopeptidase works without friction or low pH, making it ideal for sensitive skin that cannot tolerate scrubs or AHAs.
Biotech origin
Produced via fermentation, it is a sustainable and consistent ingredient that avoids animal-derived enzymes.
Cons and cautions
Limited research
Compared to papain or lactic acid, aminopeptidase has fewer clinical studies backing its efficacy and optimal use in skincare.
Formulation challenges
Enzymes are sensitive to heat, pH, and other ingredients, so products must be carefully formulated to keep aminopeptidase active.
Best for
- People with sensitive or reactive skin seeking mild exfoliation
- Those looking for a non-acid alternative to smooth skin texture
Use caution if
- Individuals with known allergies to enzymes or fermented ingredients
- Those with open wounds or active skin infections (consult a dermatologist first)
Usage tips
Safety summary
Aminopeptidase is considered safe for topical cosmetic use with low irritation and allergy risk. However, as with any enzyme, patch testing is recommended for first-time users, especially those with sensitive skin or enzyme allergies.
Research notes
Research on aminopeptidase in skincare is limited but promising. Studies on similar proteolytic enzymes (e.g., papain, bromelain) support the concept of gentle enzymatic exfoliation. More specific clinical trials are needed to confirm its long-term benefits and optimal formulation.
Common label clues
- Typical concentration
- 0.01% to 0.5%
- Regulatory status
- Generally recognized as safe for cosmetic use in the EU and US when formulated within recommended concentrations. Not a drug ingredient.
- Common uses
- Exfoliating serums, Peeling treatments, Anti-aging creams
- Environmental note
- Produced via microbial fermentation, aminopeptidase is biodegradable and has a lower environmental footprint compared to some synthetic exfoliants.
Good to know
- Aminopeptidase is often listed on labels simply as 'Aminopeptidase' and may be part of a larger enzyme blend.
- Enzyme exfoliants like aminopeptidase are generally considered safe for weekly use, but over-exfoliation can still occur if used too frequently.
Common questions
What is Aminopeptidase in beauty products?
Aminopeptidase is an enzyme that acts like tiny scissors, cutting apart protein fragments on your skin's surface. This helps loosen and remove dead skin cells, revealing a smoother, brighter complexion. Unlike harsh scrubs, it works gently without rubbing, making it suitable for sensitive skin. It's often used in serums or masks for mild exfoliation.
What does Aminopeptidase do in a beauty product?
When applied to the skin, aminopeptidase cleaves the bonds between amino acids in the proteins that hold dead skin cells together. This loosens the outer layer of the stratum corneum (the skin's topmost barrier), allowing dead cells to shed naturally. This process is called enzymatic exfoliation and is much milder than physical or acid exfoliation.
Is Aminopeptidase safe for most people?
Aminopeptidase is considered safe for topical cosmetic use with low irritation and allergy risk. However, as with any enzyme, patch testing is recommended for first-time users, especially those with sensitive skin or enzyme allergies.
Who should be careful with Aminopeptidase?
Individuals with known allergies to enzymes or fermented ingredients Those with open wounds or active skin infections (consult a dermatologist first)
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.