Ingredient review
Collagenase Hexapeptide-40
INCI: R-Clostridium Histolyticum Collagenase G Hexapeptide-40
A lab-made peptide that mimics a bacterial enzyme to encourage collagen renewal, but research is still early and mostly from the ingredient supplier.
In plain English
This ingredient is a tiny protein fragment (a peptide) that was designed to copy a part of an enzyme from a bacteria called Clostridium histolyticum. In skincare, it's meant to gently signal your skin to break down old, damaged collagen and build new, firmer collagen. Think of it as a gentle 'remodeling' signal, not a harsh exfoliant. Because it's a synthetic peptide, it's very targeted and used in tiny amounts.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is still emerging, so marketing claims deserve extra caution.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- synthetic
- Evidence
- emerging
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Collagenase Hexapeptide-40 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 Collagenase Hexapeptide-40.
- 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
emergingThe ingredient may be promising, but claims should be treated more cautiously.
What it is
A synthetic hexapeptide (a chain of six amino acids) derived from the sequence of collagenase G, an enzyme produced by the bacterium Clostridium histolyticum. It is not the whole enzyme, just a small, inactive fragment designed to interact with skin cells.
How it works
The peptide is believed to bind to receptors on skin cells (fibroblasts) and stimulate them to produce new collagen and other matrix proteins. It may also help regulate the natural breakdown of old collagen, supporting a healthier collagen balance. This is different from direct enzymatic digestion; it's a signaling mechanism.
Pros
Targeted collagen support
Designed to specifically signal collagen remodeling without harsh exfoliation, making it suitable for sensitive skin.
Low irritation potential
As a synthetic peptide used at low concentrations, it rarely causes stinging, redness, or peeling, unlike some active anti-aging ingredients.
Cons and cautions
Limited independent evidence
Most published research is from the ingredient developer, not independent academic labs, so the real-world efficacy is less certain.
Subtle and slow results
Peptides work gradually over weeks to months. Users expecting immediate firming or wrinkle reduction will be disappointed.
Best for
- People looking for a gentle, non-irritating anti-aging peptide
- Those with mature or sun-damaged skin wanting to improve firmness
Use caution if
- Anyone with a known allergy to peptides or bacterial-derived ingredients (rare)
- Those expecting fast, dramatic results
Usage tips
Safety summary
Considered safe for topical cosmetic use at typical concentrations. No significant irritation or sensitization has been reported in available studies. As with any new ingredient, a patch test is recommended for those with very sensitive skin.
Research notes
Evidence is primarily from in vitro (lab) studies and a few small clinical trials funded by the ingredient manufacturer. These suggest improvements in skin firmness and collagen density, but independent peer-reviewed research is lacking. The evidence level is considered emerging.
Common label clues
- Typical concentration
- Typically used at very low concentrations, often below 1%
- Regulatory status
- Approved for cosmetic use in the EU, US, and other major markets as a skin conditioning agent. Not classified as a drug ingredient.
- Common uses
- Anti-aging serums, Firming creams, Eye treatments
- Environmental note
- Synthetic peptides are produced via chemical synthesis, which has a moderate environmental footprint compared to plant extracts but avoids animal-derived sourcing.
Good to know
- This ingredient is not an active enzyme; it's a signaling peptide fragment, so it won't 'digest' your skin.
- Often found in premium anti-aging products due to its high cost of synthesis.
- Can be combined with other peptides or antioxidants for a synergistic effect.
Common questions
What is Collagenase Hexapeptide-40 in beauty products?
This ingredient is a tiny protein fragment (a peptide) that was designed to copy a part of an enzyme from a bacteria called Clostridium histolyticum. In skincare, it's meant to gently signal your skin to break down old, damaged collagen and build new, firmer collagen. Think of it as a gentle 'remodeling' signal, not a harsh exfoliant. Because it's a synthetic peptide, it's very targeted and used in tiny amounts.
What does Collagenase Hexapeptide-40 do in a beauty product?
The peptide is believed to bind to receptors on skin cells (fibroblasts) and stimulate them to produce new collagen and other matrix proteins. It may also help regulate the natural breakdown of old collagen, supporting a healthier collagen balance. This is different from direct enzymatic digestion; it's a signaling mechanism.
Is Collagenase Hexapeptide-40 safe for most people?
Considered safe for topical cosmetic use at typical concentrations. No significant irritation or sensitization has been reported in available studies. As with any new ingredient, a patch test is recommended for those with very sensitive skin.
Who should be careful with Collagenase Hexapeptide-40?
Anyone with a known allergy to peptides or bacterial-derived ingredients (rare) Those expecting fast, dramatic results
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.