Ingredient review
Methionyl SH-Polypeptide-31 Decapeptide-40
INCI: R-(METHIONYL SH-POLYPEPTIDE-31 DECAPEPTIDE-40)
A synthetic peptide blend that may help support collagen and improve skin firmness, but research is still emerging.
In plain English
This ingredient is a lab-made peptide, which is a short chain of amino acids (the building blocks of proteins). Peptides like this one are added to skincare to signal skin cells to produce more collagen and elastin, which can help reduce the look of wrinkles and make skin feel firmer. Because it's a complex peptide, it's often used in small amounts in anti-aging products.
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
Methionyl SH-Polypeptide-31 Decapeptide-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 Methionyl SH-Polypeptide-31 Decapeptide-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 complex composed of methionine, a sulfur-containing amino acid, linked to a polypeptide and a decapeptide. It is designed to mimic natural signaling peptides that encourage collagen production.
How it works
When applied topically, the peptide is thought to bind to receptors on skin cells, triggering a cascade of signals that promote collagen and elastin synthesis. This can help improve skin firmness and reduce the appearance of fine lines over time.
Pros
Gentle anti-aging support
Peptides are generally well-tolerated and suitable for most skin types, including sensitive skin, making them a gentle option for anti-aging routines.
Targets collagen production
By signaling skin cells to produce more collagen, this peptide may help improve skin firmness and reduce the appearance of fine lines over time.
Cons and cautions
Limited research
There is not yet a large body of clinical studies specifically on this peptide complex, so its effectiveness is less established compared to more widely studied peptides.
Subtle results
Peptides typically produce gradual, subtle improvements in skin texture and firmness, which may not meet expectations for those wanting fast or dramatic changes.
Best for
- Adults looking to support skin firmness and reduce fine lines
- Those with normal to dry skin seeking a gentle anti-aging ingredient
Use caution if
- Individuals with known allergies to synthetic peptides (rare)
- Those seeking immediate or dramatic wrinkle reduction
Usage tips
Safety summary
This peptide complex is considered safe for topical use in cosmetics at typical concentrations. It has a low risk of irritation and is not known to be comedogenic. As with any new ingredient, a patch test is recommended for those with very sensitive skin.
Research notes
Research on this specific peptide complex is limited. However, the broader class of signaling peptides has been studied for their ability to stimulate collagen synthesis and improve skin firmness. More studies are needed to confirm the efficacy of this particular blend.
Common label clues
- Typical concentration
- Typically used at 0.1% to 1% in leave-on products
- Regulatory status
- Approved for use in cosmetics in the EU, US, and other major markets. No specific restrictions beyond general cosmetic safety regulations.
- Common uses
- Anti-aging serums, Firming creams, Eye treatments
- Environmental note
- As a synthetic peptide, it is produced in a lab, which reduces the need for animal-derived ingredients and can have a lower environmental footprint compared to some natural extracts.
Good to know
- Peptides are often combined with antioxidants or hyaluronic acid in formulations for added skin benefits.
- This ingredient is synthetic, so it is suitable for vegan and cruelty-free skincare routines.
Common questions
What is Methionyl SH-Polypeptide-31 Decapeptide-40 in beauty products?
This ingredient is a lab-made peptide, which is a short chain of amino acids (the building blocks of proteins). Peptides like this one are added to skincare to signal skin cells to produce more collagen and elastin, which can help reduce the look of wrinkles and make skin feel firmer. Because it's a complex peptide, it's often used in small amounts in anti-aging products.
What does Methionyl SH-Polypeptide-31 Decapeptide-40 do in a beauty product?
When applied topically, the peptide is thought to bind to receptors on skin cells, triggering a cascade of signals that promote collagen and elastin synthesis. This can help improve skin firmness and reduce the appearance of fine lines over time.
Is Methionyl SH-Polypeptide-31 Decapeptide-40 safe for most people?
This peptide complex is considered safe for topical use in cosmetics at typical concentrations. It has a low risk of irritation and is not known to be comedogenic. As with any new ingredient, a patch test is recommended for those with very sensitive skin.
Who should be careful with Methionyl SH-Polypeptide-31 Decapeptide-40?
Individuals with known allergies to synthetic peptides (rare) Those seeking immediate or dramatic wrinkle reduction
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.