Pentapeptide-4
molecular structure · PubChem
AKA: Lys-Thr-Thr-Lys-Ser, Lysylthreonylthreonyllysylserine, PENTAPEPTIDE-4 [INCI], 149128-48-3
Synthetic
Skin Conditioner
Amino Acid
Clean
Pentapeptide-4 is a synthetic peptide containing lysine, serine and threonine
Formula
C23H45N7O9
Mol. Weight
563.60
CAS #
-
Form
Powder
Functions
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Boosts collagen production
Reduces fine lines
Traditional Use
A synthetic peptide developed in modern cosmetic research as a potential anti-aging ingredient. Created to stimulate collagen production and improve skin firmness, representing the shift toward peptide-based skincare in the late 20th century.
Skin Types
●all-skin-types
Best For
Wrinkles
Pregnancy & Breastfeeding Safe
Yes
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory1 listing →
🛡️Safety-assessed2 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR