Keratin Amino Acids

Keratin Amino Acids 1
AKA: Hydrolyzed keratin amino acids, Keratin hydrolysate, Broken down keratin
Synthetic
Skin Conditioner
Hair Care
Amino Acid
Acid
Clean
Keratins, hydrolyzates
Effective at 3.0%
CAS #
156715-41-2
Form
Powder
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
Traditional Use
Keratin was first isolated from animal hair and nails in the 19th century. Modern keratin cosmetics were developed in the 1960s-70s as hair strengthening and conditioning treatments, derived from hydrolyzed keratin proteins found naturally in the outer layer of skin and hair.
EWG
1
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
medical-approval
all-shades-safe
Phototoxicity Concern
Concentration Guide
1e-05%
6.0%
0.5%
0%100%
Reported use
Reg. Limit
CIR reported use: 0.0003-6 | 0.00001-0.5
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Skin Types
●all-skin-types
Best For
Loss of Elasticity
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: CosIng · EWG · CIR