Ingredient review
Recombinant Silk Polypeptide-69
INCI: TRANSGENIC SILKWORM RH-POLYPEPTIDE-69
A lab-made silk protein that may help hydrate and smooth skin, but human studies are limited.
In plain English
This ingredient is a protein fragment made by genetically modified silkworms. In skincare, it is meant to form a thin, breathable film on the skin that holds in moisture and makes the surface feel smoother. Think of it like a very lightweight, invisible glove that helps your skin stay hydrated.
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
- biotech
- Evidence
- emerging
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Recombinant Silk Polypeptide-69 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 Recombinant Silk Polypeptide-69.
- 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 recombinant (lab-engineered) polypeptide derived from silk fibroin, produced using transgenic silkworms. It is a small protein fragment designed to mimic the beneficial properties of natural silk.
How it works
When applied to the skin, it forms a flexible film that reduces water loss (transepidermal water loss, or TEWL — the amount of moisture that evaporates from your skin). It also has humectant properties, meaning it attracts water to the skin's surface, and may temporarily fill in fine lines by plumping the outer layer.
Pros
Lightweight hydration
Forms a thin film that helps keep moisture in without feeling heavy or sticky, making it suitable for all skin types including oily skin.
Smoothing effect
Can temporarily fill in fine lines and uneven texture, giving the skin a softer, more even appearance.
Cons and cautions
Limited research
Most evidence comes from lab studies or small trials; large-scale human studies proving long-term anti-aging benefits are lacking.
Not vegan-friendly
Produced using transgenic silkworms, so it is not suitable for strict vegans or those avoiding animal-derived ingredients.
Best for
- People looking for a lightweight hydrating ingredient
- Those interested in biotech-derived skincare innovations
Use caution if
- Individuals with known allergies to silk proteins (rare)
- Strict vegans who avoid any animal-derived inputs
Usage tips
Safety summary
Available safety data suggest low irritation and sensitization potential. However, long-term safety data on this specific recombinant polypeptide are limited. Patch testing is recommended for sensitive individuals.
Research notes
Evidence is primarily from in vitro studies and small clinical trials on similar silk peptides. Larger, peer-reviewed human studies on this exact ingredient are scarce, so efficacy claims should be viewed with caution.
Common label clues
- Typical concentration
- 0.1% to 2%
- Regulatory status
- Generally recognized as safe for cosmetic use in the US and EU when used as directed. Not a drug ingredient.
- Common uses
- Anti-aging serums, Hydrating creams, Sheet masks
- Environmental note
- Production via transgenic silkworms has a lower environmental footprint than traditional silk farming, but still relies on animal biotechnology.
Good to know
- This ingredient is a specific recombinant polypeptide, not the same as whole silk protein or hydrolyzed silk.
- It is often used in high-end anti-aging products due to its novel biotech origin.
Common questions
What is Recombinant Silk Polypeptide-69 in beauty products?
This ingredient is a protein fragment made by genetically modified silkworms. In skincare, it is meant to form a thin, breathable film on the skin that holds in moisture and makes the surface feel smoother. Think of it like a very lightweight, invisible glove that helps your skin stay hydrated.
What does Recombinant Silk Polypeptide-69 do in a beauty product?
When applied to the skin, it forms a flexible film that reduces water loss (transepidermal water loss, or TEWL — the amount of moisture that evaporates from your skin). It also has humectant properties, meaning it attracts water to the skin's surface, and may temporarily fill in fine lines by plumping the outer layer.
Is Recombinant Silk Polypeptide-69 safe for most people?
Available safety data suggest low irritation and sensitization potential. However, long-term safety data on this specific recombinant polypeptide are limited. Patch testing is recommended for sensitive individuals.
Who should be careful with Recombinant Silk Polypeptide-69?
Individuals with known allergies to silk proteins (rare) Strict vegans who avoid any animal-derived inputs
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.