Keratin Amino Acids
AKA “Hydrolyzed keratin amino acids, Keratin hydrolysate, Broken down keratin
Synthetic
Ingredient Facts
Keratin amino acids
AKA: Hydrolyzed keratin amino acids, Keratin hydrolysate, Broken down keratin
Synthetic · Antistatic · EWG: 4
Plant-Derived Synthetic
Skin Conditioner
Hair Care
Amino Acid
Synthetic
Clean
Keratins, hydrolyzates Science: Functions: Antistatic, Hair Conditioning, Skin Conditioning Safety Ratings: CIR: Safe as used
Effective at 3.0%
CAS #
156715-41-2
Form
Powder
See origin →
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.
Skin Types
all-skin-types
Best For
Loss of Elasticity
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Safe
Pregnancy
Yes
CIR Safety Findings
medical-approval
all-shades-safe
Phototoxicity Concern
Concentration Guide
1e-05%
6.0%
0.5%
0%100%
Effective Range
Reg. Limit
CIR reported use: 0.0003-6 | 0.00001-0.5
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Verified Feb 2026
Data: CosIng · EWG · CIR