Synthetic Peptide
TETRAPEPTIDE-121
Safety score · 0–100
Fine
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
Tetrapeptide-121 is a synthetic four-amino-acid signal peptide used for cosmetic skin conditioning. Peptides at this length show excellent dermal tolerance but specific efficacy data is limited.
Function
Skin benefits
- Synthetic signal peptide
- Targets specific skin pathways
- Low irritation potential
- Stable in formulation
Known concerns
- Sparse independent clinical data
- Marketing claims often exceed evidence
- Variable manufacturer quality
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, so always read the physical product label and consult a healthcare professional for personal concerns.