Ingredient review
Silkworm Polypeptide-2
INCI: SR-SILKWORM POLYPEPTIDE-2
A gentle silk-derived peptide that helps hydrate and temporarily smooth the skin's surface.
In plain English
This ingredient is a protein fragment made from silkworm silk. In skincare, it works by forming a thin, invisible film on your skin that helps lock in moisture and makes the surface feel softer and smoother. Think of it like a lightweight, breathable veil that holds water close to your skin without feeling heavy or sticky.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is useful, but some claims depend heavily on the formula.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- natural
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Silkworm Polypeptide-2 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 Silkworm Polypeptide-2.
- 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
A polypeptide (short chain of amino acids) derived from the fibroin protein of silkworm silk. It is produced through controlled hydrolysis, breaking down the larger silk protein into smaller, more skin-friendly fragments.
How it works
When applied to the skin, Silkworm Polypeptide-2 forms a flexible, transparent film that reduces water loss (transepidermal water loss, or TEWL — the amount of moisture that evaporates from your skin). The amino acids also attract water molecules, providing additional hydration. The film can temporarily fill in fine lines and uneven texture, giving a smoother appearance.
Pros
Lightweight hydration
It attracts moisture and helps keep it on your skin without feeling greasy or sticky, making it suitable for all skin types including oily and combination skin.
Gentle and low-irritation
Most people can use it without redness or stinging, even those with sensitive skin, because it is a natural protein derivative that mimics the skin's own amino acids.
Cons and cautions
Temporary effects
The smoothing and hydrating benefits are not permanent — they last only as long as the product stays on your skin and wash off with cleansing.
Limited anti-aging evidence
While it can temporarily plump fine lines, there is not enough research to support long-term wrinkle reduction or collagen stimulation compared to ingredients like retinol or peptides.
Best for
- Anyone looking for extra hydration without heavy oils
- People with dry or dehydrated skin
- Those who want a temporary smoothing effect before makeup
Use caution if
- Individuals with a known allergy to silk or silkworm proteins
Usage tips
Safety summary
Silkworm Polypeptide-2 is considered safe for topical use in cosmetics at typical concentrations. Allergic reactions are rare but possible in individuals with silk protein sensitivity. No known toxicity or irritation concerns in standard cosmetic use.
Research notes
Research on silk peptides in skincare is moderate. Studies show they can improve skin hydration and reduce TEWL. However, most evidence comes from in vitro or small human studies, and more large-scale clinical trials are needed to confirm long-term benefits.
Common label clues
- Typical concentration
- 0.1% to 2%
- Regulatory status
- Approved for use in cosmetics in the US, EU, and most major markets. No specific restrictions beyond general cosmetic safety requirements.
- Common uses
- Serums, Moisturizers, Eye creams, Sheet masks
- Environmental note
- Silkworm farming for silk production has a moderate environmental footprint, but the polypeptide is a byproduct of the silk industry, making it a more sustainable use of existing resources.
Good to know
- Silk polypeptides are often used in luxury skincare for their silky feel
- They are vegan-friendly alternatives to animal-derived collagen in some formulations
- The ingredient is water-soluble and works well in gel-based or serum textures
Common questions
What is Silkworm Polypeptide-2 in beauty products?
This ingredient is a protein fragment made from silkworm silk. In skincare, it works by forming a thin, invisible film on your skin that helps lock in moisture and makes the surface feel softer and smoother. Think of it like a lightweight, breathable veil that holds water close to your skin without feeling heavy or sticky.
What does Silkworm Polypeptide-2 do in a beauty product?
When applied to the skin, Silkworm Polypeptide-2 forms a flexible, transparent film that reduces water loss (transepidermal water loss, or TEWL — the amount of moisture that evaporates from your skin). The amino acids also attract water molecules, providing additional hydration. The film can temporarily fill in fine lines and uneven texture, giving a smoother appearance.
Is Silkworm Polypeptide-2 safe for most people?
Silkworm Polypeptide-2 is considered safe for topical use in cosmetics at typical concentrations. Allergic reactions are rare but possible in individuals with silk protein sensitivity. No known toxicity or irritation concerns in standard cosmetic use.
Who should be careful with Silkworm Polypeptide-2?
Individuals with a known allergy to silk or silkworm proteins
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.