Ingredient review

SH-Polypeptide-28

INCI: SH-Polypeptide-28

SH-Polypeptide-28 is a synthetic peptide that may help reduce fine lines and improve skin firmness by signaling collagen production, but research is still emerging.

beautyskincarepeptide

In plain English

SH-Polypeptide-28 is a lab-made protein fragment (a peptide) that your skin can use as a signal to produce more collagen and elastin. Think of it as a tiny messenger that tells your skin cells to act younger and firmer. It's commonly added to anti-aging products like serums and eye creams. Because it's synthetic, it's stable and consistent, but it works slowly and results vary from person to person.

Review score

Safety, usefulness, and evidence

4.0Good

4.0/ 5

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

How reviews are scored

Quick decision guide

Useful, but context matters

SH-Polypeptide-28 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-28.
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

low

Less likely to sting, burn, or bother most users, though sensitive skin can still react.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

moderate

There is useful support, but formula details and claim strength still matter.

What it is

SH-Polypeptide-28 is a synthetic peptide, meaning it's a short chain of amino acids made in a lab. It belongs to a class of ingredients called signal peptides, which are designed to mimic natural peptides in the skin that trigger repair and renewal processes.

How it works

When applied topically, SH-Polypeptide-28 penetrates the outer layer of skin and binds to receptors on fibroblasts (the cells that make collagen). This binding sends a signal to increase collagen and elastin production, which can help plump the skin, reduce fine lines, and improve firmness over time.

Pros

Gentle on skin

SH-Polypeptide-28 has a low irritation risk, making it suitable for sensitive skin types that may react to stronger anti-aging ingredients like retinol or acids.

Supports collagen naturally

Instead of forcing skin to shed or inflame, this peptide works by signaling your own cells to produce more collagen, leading to gradual, natural-looking improvements in firmness.

Cons and cautions

Slow results

You may need to use products with SH-Polypeptide-28 consistently for several months before noticing visible changes in fine lines or firmness.

Higher cost

Peptide-based products tend to be more expensive than many other anti-aging options, which may not fit every budget.

Best for

People looking for a gentle anti-aging ingredient
Those with sensitive skin who cannot tolerate retinol
Individuals wanting to improve skin firmness and elasticity

Use caution if

Those expecting immediate or dramatic results
People with very limited budgets for skincare

Usage tips

Apply peptide serums to clean, damp skin for better absorption.

Use consistently twice daily for at least 8–12 weeks to see potential benefits.

Layer with a moisturizer to lock in the peptide and support skin barrier function.

Safety summary

SH-Polypeptide-28 is considered safe for cosmetic use at typical concentrations. It has a low risk of irritation and is not known to be comedogenic. As with any new ingredient, patch testing is recommended for those with very sensitive skin.

Research notes

Research on SH-Polypeptide-28 specifically is limited, but it belongs to a well-studied class of signal peptides. Studies on similar peptides show they can stimulate collagen synthesis in vitro and in small human trials, leading to modest improvements in wrinkle depth and skin firmness. More large-scale, long-term studies are needed.

Common label clues

Typical concentration: 0.001% to 0.1%
Regulatory status: SH-Polypeptide-28 is a cosmetic ingredient regulated as a cosmetic by the FDA in the US and similar bodies worldwide. It is not a drug and is not intended to treat or prevent disease.
Common uses: Anti-aging serums, Eye creams, Firming lotions
Environmental note: As a synthetic peptide, SH-Polypeptide-28 is produced in controlled lab conditions, which reduces environmental impact compared to harvesting from natural sources. However, its production requires chemical synthesis and energy.

Good to know

SH-Polypeptide-28 is often combined with other peptides or antioxidants for enhanced anti-aging effects.
It is stable in most formulations but can be deactivated by very low pH (acidic) products.

Common questions

What is SH-Polypeptide-28 in beauty products?

What does SH-Polypeptide-28 do in a beauty product?

Is SH-Polypeptide-28 safe for most people?

Who should be careful with SH-Polypeptide-28?

Those expecting immediate or dramatic results People with very limited budgets for skincare

Research sources

Cosmetic Ingredient Review (CIR) - Safety of PeptidesOpen PubMed - Signal Peptides in CosmeticsOpen FDA - Cosmetics OverviewOpen

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.