Ingredient review
Subtilisin
INCI: SUBTILISIN
Subtilisin is a gentle enzyme exfoliant that dissolves dead skin cells, but it can be irritating for sensitive skin if left on too long.
In plain English
Subtilisin is a protein-dissolving enzyme made from bacteria. In skincare, it works like a gentle chemical exfoliant, breaking down the bonds that hold dead skin cells together so they can be rinsed away. This helps reveal smoother, brighter skin without the gritty texture of a scrub. Because it's an enzyme, it works best in a specific pH range and is often used in rinse-off products like cleansers or masks.
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
Subtilisin 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 Subtilisin.
- 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
Subtilisin is a protease enzyme (a type of protein that breaks down other proteins) produced by the bacterium Bacillus subtilis. It is used in skincare as a gentle exfoliant to remove dead skin cells.
How it works
Subtilisin works by cleaving peptide bonds in keratin, the protein that makes up the outer layer of dead skin cells. This loosens the bonds between dead cells, allowing them to be easily washed away, revealing fresher skin underneath.
Pros
Gentle exfoliation
Subtilisin dissolves dead skin cells without the need for abrasive particles, making it a good option for those who find physical scrubs too harsh.
Brightens skin
By removing the buildup of dead cells, it can help improve skin's overall radiance and smoothness with regular use.
Cons and cautions
Potential irritation
If left on the skin too long or used too frequently, subtilisin can cause redness, stinging, or irritation, especially for sensitive skin types.
pH sensitivity
The enzyme is only active within a narrow pH range (typically around 7-8), so its effectiveness can vary depending on the product formulation.
Best for
- People with normal to oily skin looking for gentle exfoliation
- Those who prefer enzyme exfoliants over acids or scrubs
Use caution if
- Individuals with very sensitive, irritated, or broken skin
Usage tips
Safety summary
Subtilisin is considered safe for cosmetic use at typical concentrations in rinse-off products. However, it can cause irritation if misused (e.g., left on the skin too long) or on already sensitive skin. Patch testing is recommended for first-time users.
Research notes
Research supports subtilisin's effectiveness as a gentle exfoliant, with studies showing it can improve skin texture and brightness. Most evidence comes from ingredient-level studies rather than large-scale clinical trials, so its efficacy is moderately supported.
Common label clues
- Typical concentration
- 0.01% to 0.5% in rinse-off products
- Regulatory status
- Approved for use in cosmetics in the EU, US, and many other regions. Concentration limits may apply in leave-on products, but it is primarily used in rinse-off formulations.
- Common uses
- Exfoliating cleansers, Peeling masks, Enzyme peels
- Environmental note
- Subtilisin is produced via fermentation of Bacillus subtilis, a naturally occurring soil bacterium. It is biodegradable and generally considered environmentally low-impact.
Good to know
- Subtilisin is often listed under its INCI name on ingredient labels.
- It is commonly used in enzyme peels and exfoliating cleansers, not in leave-on creams or serums.
Common questions
What is Subtilisin in beauty products?
Subtilisin is a protein-dissolving enzyme made from bacteria. In skincare, it works like a gentle chemical exfoliant, breaking down the bonds that hold dead skin cells together so they can be rinsed away. This helps reveal smoother, brighter skin without the gritty texture of a scrub. Because it's an enzyme, it works best in a specific pH range and is often used in rinse-off products like cleansers or masks.
What does Subtilisin do in a beauty product?
Subtilisin works by cleaving peptide bonds in keratin, the protein that makes up the outer layer of dead skin cells. This loosens the bonds between dead cells, allowing them to be easily washed away, revealing fresher skin underneath.
Is Subtilisin safe for most people?
Subtilisin is considered safe for cosmetic use at typical concentrations in rinse-off products. However, it can cause irritation if misused (e.g., left on the skin too long) or on already sensitive skin. Patch testing is recommended for first-time users.
Who should be careful with Subtilisin?
Individuals with very sensitive, irritated, or broken skin
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.