Ingredient review
SH-Polypeptide-29
INCI: SH-Polypeptide-29
A synthetic peptide that may help reduce fine lines by signaling skin to produce more collagen, but results are subtle and require consistent use.
In plain English
SH-Polypeptide-29 is a lab-made protein fragment that tells your skin cells to make more collagen. Collagen is the scaffolding that keeps skin plump and firm. As we age, collagen production slows, leading to wrinkles. This peptide acts like a messenger, nudging cells to rebuild that support structure. It's not a quick fix—you'll need to use it regularly for weeks to see any difference, and it works best as part of a broader routine with sunscreen and moisturizer.
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-29 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-29.
- 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 synthetic peptide, specifically a short chain of amino acids, designed to mimic natural signaling molecules in the skin. It is often referred to as a 'signal peptide' because it communicates with skin cells to boost collagen synthesis.
How it works
When applied topically, SH-Polypeptide-29 penetrates the outer layer of skin and binds to receptors on fibroblasts (the cells that make collagen). This binding triggers a cascade of cellular signals that increase the production of collagen and other structural proteins, helping to improve skin firmness and reduce the appearance of fine lines over time.
Pros
Gentle on skin
SH-Polypeptide-29 has a low irritation risk, making it suitable for sensitive skin types that react to stronger anti-aging ingredients.
Supports natural collagen
It works by encouraging your skin's own collagen production, which can lead to gradual improvements in firmness and texture without harsh side effects.
Cons and cautions
Subtle, slow results
You won't see overnight changes. It typically takes 4–8 weeks of consistent use to notice any reduction in fine lines, and the effect is modest.
Variable effectiveness
The peptide's performance depends heavily on the product's formulation—how well it penetrates and stays stable. Not all products deliver the same results.
Best for
- Adults looking for a gentle anti-aging option
- Those with sensitive skin who cannot tolerate stronger actives like retinol
Use caution if
- Anyone expecting dramatic, instant results
- People with very severe skin laxity who may need professional treatments
Usage tips
Safety summary
SH-Polypeptide-29 is considered safe for topical cosmetic use at typical concentrations. It has a low risk of irritation and is not known to be comedogenic. No serious adverse effects have been reported in available studies or post-market surveillance.
Research notes
Evidence for SH-Polypeptide-29 comes primarily from in vitro studies and small clinical trials showing increased collagen synthesis and reduced wrinkle depth. Larger, long-term human studies are limited, but the ingredient is supported by the broader body of research on signal peptides in skincare.
Common label clues
- Typical concentration
- 0.001% to 0.1%
- Regulatory status
- Approved for cosmetic use in the US, EU, and other major markets as a skin conditioning agent. It is not classified as a drug and does not require FDA pre-market approval.
- 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 associated with harvesting natural ingredients. However, its production involves chemical synthesis that may have a moderate carbon footprint.
Good to know
- SH-Polypeptide-29 is often listed on labels as 'Acetyl Hexapeptide-29' or simply 'Polypeptide-29'.
- It is water-soluble, so it works best in water-based serums rather than oil-based products.
Common questions
What is SH-Polypeptide-29 in beauty products?
SH-Polypeptide-29 is a lab-made protein fragment that tells your skin cells to make more collagen. Collagen is the scaffolding that keeps skin plump and firm. As we age, collagen production slows, leading to wrinkles. This peptide acts like a messenger, nudging cells to rebuild that support structure. It's not a quick fix—you'll need to use it regularly for weeks to see any difference, and it works best as part of a broader routine with sunscreen and moisturizer.
What does SH-Polypeptide-29 do in a beauty product?
When applied topically, SH-Polypeptide-29 penetrates the outer layer of skin and binds to receptors on fibroblasts (the cells that make collagen). This binding triggers a cascade of cellular signals that increase the production of collagen and other structural proteins, helping to improve skin firmness and reduce the appearance of fine lines over time.
Is SH-Polypeptide-29 safe for most people?
SH-Polypeptide-29 is considered safe for topical cosmetic use at typical concentrations. It has a low risk of irritation and is not known to be comedogenic. No serious adverse effects have been reported in available studies or post-market surveillance.
Who should be careful with SH-Polypeptide-29?
Anyone expecting dramatic, instant results People with very severe skin laxity who may need professional treatments
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.