Ingredient review
SH-Polypeptide-31
INCI: SH-Polypeptide-31
SH-Polypeptide-31 is a synthetic peptide that signals skin cells to boost collagen, helping reduce fine lines and improve firmness with minimal irritation risk.
In plain English
SH-Polypeptide-31 is a lab-made chain of amino acids (a peptide) that acts like a messenger to your skin cells. When applied in a serum or cream, it tells your skin to produce more collagen and elastin, which are the proteins that keep skin plump and firm. Over time, this can help soften the look of fine lines and make skin feel tighter. It's a gentle ingredient, so it's suitable for most skin types, including sensitive skin.
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
- synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
SH-Polypeptide-31 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-31.
- 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
SH-Polypeptide-31 is a synthetic peptide, meaning it's a short chain of amino acids created in a laboratory. Peptides like this are designed to mimic natural signaling molecules in the skin that trigger repair and renewal processes.
How it works
When applied topically, SH-Polypeptide-31 penetrates the outer layer of skin and binds to specific receptors on fibroblasts (the cells that make collagen). This binding sends a signal to ramp up collagen and elastin production, helping to counteract the natural decline in these proteins that occurs with aging. The result is firmer, smoother skin over weeks of consistent use.
Pros
Gentle anti-aging support
SH-Polypeptide-31 is well-tolerated by most skin types, including sensitive and reactive skin, making it a low-risk addition to an anti-aging routine.
Targets collagen production
Unlike some ingredients that only hydrate or plump, this peptide actively signals skin cells to produce more collagen, addressing a root cause of aging skin.
Cons and cautions
Slow visible results
You won't see changes overnight — it typically takes 4 to 8 weeks of daily use before fine lines start to soften, which may test your patience.
Less research than classic peptides
While promising, SH-Polypeptide-31 has fewer published human studies compared to well-established peptides like Matrixyl, so the evidence base is still growing.
Best for
- Anyone looking to reduce fine lines and improve skin firmness
- People with sensitive skin who want a gentle anti-aging option
Use caution if
- Those seeking immediate results — peptides take weeks to show visible effects
Usage tips
Safety summary
SH-Polypeptide-31 is considered safe for cosmetic use at typical concentrations. It has a low irritation and comedogenic risk, making it suitable for most skin types. No significant adverse effects have been reported in available studies.
Research notes
Research on SH-Polypeptide-31 is moderate. In vitro studies show it stimulates collagen synthesis, and small clinical trials indicate improvements in skin firmness and wrinkle depth after 8 weeks. More large-scale, long-term human studies would strengthen the evidence.
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. It is not classified as a drug and does not require FDA pre-market approval.
- Common uses
- Anti-aging serums, Firming creams, Eye treatments
- Environmental note
- As a synthetic peptide, it is produced in controlled lab conditions, which reduces the environmental impact compared to harvesting from natural sources. However, its production involves chemical synthesis that may have a moderate carbon footprint.
Good to know
- Peptides are fragile — avoid using them with very low pH (under 4) or high pH (over 7) products in the same routine.
- SH-Polypeptide-31 is often listed near the middle or end of an ingredient list because it's effective at low concentrations.
Common questions
What is SH-Polypeptide-31 in beauty products?
SH-Polypeptide-31 is a lab-made chain of amino acids (a peptide) that acts like a messenger to your skin cells. When applied in a serum or cream, it tells your skin to produce more collagen and elastin, which are the proteins that keep skin plump and firm. Over time, this can help soften the look of fine lines and make skin feel tighter. It's a gentle ingredient, so it's suitable for most skin types, including sensitive skin.
What does SH-Polypeptide-31 do in a beauty product?
When applied topically, SH-Polypeptide-31 penetrates the outer layer of skin and binds to specific receptors on fibroblasts (the cells that make collagen). This binding sends a signal to ramp up collagen and elastin production, helping to counteract the natural decline in these proteins that occurs with aging. The result is firmer, smoother skin over weeks of consistent use.
Is SH-Polypeptide-31 safe for most people?
SH-Polypeptide-31 is considered safe for cosmetic use at typical concentrations. It has a low irritation and comedogenic risk, making it suitable for most skin types. No significant adverse effects have been reported in available studies.
Who should be careful with SH-Polypeptide-31?
Those seeking immediate results — peptides take weeks to show visible effects
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.