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Skin Conditioning

TETRAPEPTIDE-21

78

Safety score · 0–100

Fine

Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.

A synthetic four-amino-acid signal peptide marketed for skin firmness and collagen support. Like other small peptides, low irritation expected at use levels.

Function

SKIN CONDITIONING

Skin benefits

  • Synthetic signal peptide
  • Marketed for collagen-supporting effects
  • Low-irritation profile

Known concerns

  • Limited public safety data
  • Activity claims often based on supplier studies
  • Stability requires careful formulation

References

EU

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.