Antioxidant
CYSTEINYL TRIPEPTIDE-35
Safety score · 0–100
Fine
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
Cysteinyl Tripeptide-35 — a peptide with a cysteine thiol for antioxidant action. Promising but mostly evidenced by supplier data.
Cysteinyl Tripeptide-35 is a synthetic tripeptide carrying a cysteine residue that contributes a reactive thiol (-SH) group capable of quenching reactive oxygen species and supporting glutathione-type defence. Marketed for anti-pollution and anti-oxidative-stress claims. Listed in EU CosIng; no SCCS opinion. Public toxicological literature is minimal; use levels are low (typically <1%). Thiol chemistry needs careful formulation (pH, oxygen, chelation) to remain active. Patch-test record appears unremarkable but the evidence base is supplier-dominated.
Function
Skin benefits
- Thiol-based antioxidant
- Targets oxidative-stress claims
- Low-use-level exposure
Known concerns
- Thin public safety data
- No SCCS dossier
- Formulation-sensitive
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve — always read the physical product label and consult a healthcare professional for personal concerns.