murphyKeratin
molecular structure · PubChem
AKA: Hair Protein
Synthetic
Skin Conditioner
Hair Care
Clean
Origin-Derived (wool/feathers) or Plant-Derived
Keratins. Natural, fibrous proteins occurring in vertebrates. They contain all of the common amino acids and are characterized by high cystine content
CAS #
68238-35-7
Form
Powder
State
Solid
Skin Types
●all-skin-types
Best For
Rough Texture
Pregnancy & Breastfeeding Safe
Yes
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
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.
EWG
2
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Skin Irritant
2 studies / 2 not irritating (CIR 713)
Not an Eye Irritant
1 study / 1 not irritating (CIR 713)
Not a Sensitizer
1 study / 1 not sensitizing (CIR 713)
Concentration Guide
Leave-on0.075%
Rinse-offNot reported
0%50%100%
CIR reported use · report published 2021
Regulatory Agencies
Verified Jun 2026
Data: CosIng · EWG · CIR