Ingredient review
SH-Polypeptide-40
INCI: SH-Polypeptide-40
SH-Polypeptide-40 is a lab-made peptide that may help support skin firmness and reduce the look of fine lines, but research is still early.
In plain English
SH-Polypeptide-40 is a short chain of amino acids (the building blocks of protein) made in a lab. When applied to skin, it's thought to signal skin cells to produce more collagen and other supportive proteins, which can help skin look firmer and smoother over time. Think of it as a tiny messenger that tells your skin to act younger.
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
SH-Polypeptide-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 SH-Polypeptide-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 peptide, specifically a hexapeptide (six amino acids linked together), engineered to mimic natural signaling molecules in the skin that encourage collagen production.
How it works
It is believed to bind to receptors on skin cells and trigger a cascade of signals that increase the production of collagen and elastin, the proteins that give skin structure and bounce. This can lead to a visible reduction in fine lines and improved skin firmness with consistent use.
Pros
Gentle anti-aging support
Unlike strong retinoids or acids, SH-Polypeptide-40 is very unlikely to cause irritation, making it suitable for sensitive skin types.
Targets skin firmness
It specifically aims to boost collagen production, which can help improve skin's structural support and reduce sagging over time.
Cons and cautions
Limited research
Compared to well-studied peptides like Matrixyl, SH-Polypeptide-40 has fewer published studies, so its effectiveness is less certain.
Slow, subtle results
You won't see changes overnight. It can take 8–12 weeks of daily use to notice any visible improvement in fine lines.
Best for
- Adults looking to reduce early signs of aging like fine lines and loss of firmness
- People with sensitive skin who want a gentle anti-aging option
Use caution if
- Those expecting immediate or dramatic results — peptides work slowly and subtly
Usage tips
Safety summary
SH-Polypeptide-40 is considered safe for topical cosmetic use. It has a low irritation and comedogenic risk, and no significant safety concerns have been reported in available literature.
Research notes
Research on SH-Polypeptide-40 specifically is limited. However, the broader class of signaling peptides has moderate evidence supporting collagen stimulation and anti-aging benefits. Most data comes from in vitro studies and small clinical trials.
Common label clues
- Typical concentration
- Typically used at 0.5% to 2% in leave-on products
- Regulatory status
- Approved as a cosmetic ingredient in the US, EU, and other major markets. Not classified as a drug, so anti-aging claims are limited to cosmetic effects.
- Common uses
- Anti-aging serums, Eye creams, Firming lotions
- Environmental note
- As a synthetic peptide, it is produced in controlled lab conditions, which reduces the environmental impact compared to harvesting from natural sources.
Good to know
- Peptides like SH-Polypeptide-40 work best when combined with other anti-aging ingredients like antioxidants (vitamin C) and moisturizers.
- It is water-soluble and typically found in lightweight serums or gel-based formulas.
Common questions
What is SH-Polypeptide-40 in beauty products?
SH-Polypeptide-40 is a short chain of amino acids (the building blocks of protein) made in a lab. When applied to skin, it's thought to signal skin cells to produce more collagen and other supportive proteins, which can help skin look firmer and smoother over time. Think of it as a tiny messenger that tells your skin to act younger.
What does SH-Polypeptide-40 do in a beauty product?
It is believed to bind to receptors on skin cells and trigger a cascade of signals that increase the production of collagen and elastin, the proteins that give skin structure and bounce. This can lead to a visible reduction in fine lines and improved skin firmness with consistent use.
Is SH-Polypeptide-40 safe for most people?
SH-Polypeptide-40 is considered safe for topical cosmetic use. It has a low irritation and comedogenic risk, and no significant safety concerns have been reported in available literature.
Who should be careful with SH-Polypeptide-40?
Those expecting immediate or dramatic results — peptides work slowly and subtly
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.