Ingredient review
SH-Polypeptide-66
INCI: SH-Polypeptide-66
A lab-made peptide that may help support collagen and reduce fine lines, but human research is still limited.
In plain English
SH-Polypeptide-66 is a short chain of amino acids (the building blocks of protein) made in a lab. In skincare, it's added to signal skin cells to produce more collagen and elastin, which can help plump the skin and soften the look of fine lines. Because it's a large molecule, it works best when the formula includes ingredients that help it absorb into the deeper layers of skin.
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-66 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-66.
- 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), designed to mimic natural signaling proteins in the skin.
How it works
When applied topically, SH-Polypeptide-66 is thought to bind to receptors on skin cells and trigger a cascade that encourages collagen and elastin production. This can lead to firmer, more resilient skin over time, though results vary by formulation and individual skin type.
Pros
Low irritation
SH-Polypeptide-66 is generally non-irritating and suitable for sensitive skin, making it a gentle anti-aging option.
Collagen support
It may help stimulate collagen production, which can improve skin firmness and reduce fine lines over time.
Cons and cautions
Limited evidence
Compared to more established peptides, SH-Polypeptide-66 has fewer published human studies, so its effectiveness is less certain.
Delivery challenges
As a large molecule, it may not penetrate deeply without a well-designed formula, limiting its potential benefits.
Best for
- Adults looking for gentle anti-aging support
- Those with sensitive skin who want a low-irritation peptide option
Use caution if
- Anyone allergic to synthetic peptides (rare)
- Those expecting dramatic, instant results (peptides work gradually)
Usage tips
Safety summary
SH-Polypeptide-66 is considered safe for topical use at typical cosmetic concentrations. No significant safety concerns have been reported, though long-term data is limited.
Research notes
Evidence is primarily from in vitro and small-scale studies. More robust human trials are needed to confirm anti-aging claims.
Common label clues
- Typical concentration
- 0.001% to 0.1%
- Regulatory status
- Approved as a cosmetic ingredient in the EU, US, and other major markets. Not classified as a drug.
- Common uses
- Anti-aging serums, Firming creams, Eye treatments
- Environmental note
- Synthetic peptides are produced via chemical synthesis, which has a moderate environmental footprint compared to plant extracts.
Good to know
- Peptides are often listed near the end of ingredient lists because they're effective at very low concentrations.
- SH-Polypeptide-66 is not the same as copper peptides or growth factors.
Common questions
What is SH-Polypeptide-66 in beauty products?
SH-Polypeptide-66 is a short chain of amino acids (the building blocks of protein) made in a lab. In skincare, it's added to signal skin cells to produce more collagen and elastin, which can help plump the skin and soften the look of fine lines. Because it's a large molecule, it works best when the formula includes ingredients that help it absorb into the deeper layers of skin.
What does SH-Polypeptide-66 do in a beauty product?
When applied topically, SH-Polypeptide-66 is thought to bind to receptors on skin cells and trigger a cascade that encourages collagen and elastin production. This can lead to firmer, more resilient skin over time, though results vary by formulation and individual skin type.
Is SH-Polypeptide-66 safe for most people?
SH-Polypeptide-66 is considered safe for topical use at typical cosmetic concentrations. No significant safety concerns have been reported, though long-term data is limited.
Who should be careful with SH-Polypeptide-66?
Anyone allergic to synthetic peptides (rare) Those expecting dramatic, instant results (peptides work gradually)
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.