murphyKeratin Amino Acids
molecular structure · PubChem
AKA: Hydrolyzed keratin amino acids, Keratin hydrolysate, Broken down keratin
Synthetic
Skin Conditioner
Hair Care
Amino Acid
Acid
Clean
Origin-Derived (wool/feathers) or Plant-Derived
Keratins, hydrolyzates
CAS #
156715-41-2
Form
Powder
Skin Types
●all-skin-types
Best For
Loss of Elasticity
Pregnancy & Breastfeeding Safe
Yes
Functions
Antistatic
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
1
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Skin Irritant
1 study / 1 not irritating (CIR 625)
Not an Eye Irritant
1 study / 1 not irritating (CIR 625)
Concentration Guide
Leave-on0.00001–0.5%
Rinse-off0.0005–0.5%
0%50%100%
Reg. limit 0.5%
CIR reported use · report published 2014
Regulatory Agencies
Verified Jun 2026
Data: CosIng · EWG · CIR