Hydrolyzed Fibroin

Hydrolyzed Fibroin molecular structure
molecular structure · PubChem
AKA: Silk Fibroin Hydrolysate, Hydrolyzed Silk Protein
Synthetic
Skin Conditioner
Hair Care
Not Clean
Protein hydrolyzates, fibroin
Form
Liquid
Functions
Hair Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Locks in moisture
Traditional Use
Fibroin is the primary protein in silk; sericulture dates back thousands of years in Asia. Hydrolyzed fibroin was developed in the 20th century for cosmetics to provide silk's traditional skin-smoothing and conditioning benefits.
EWG
4
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not Phototoxic
medical-approval
all-shades-safe
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Skin Types
●all-skin-types
Best For
Dryness
Pregnancy & Breastfeeding Safe
Yes
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory1 listing →
🛡️Safety-assessed1 review →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: CosIng · EWG · CIR