Hair Keratin Amino Acids
AKA “Hydrolyzed keratin amino acids, keratin hydrolysate”
Synthetic
Ingredient Facts
Hair keratin amino acids
AKA: Hydrolyzed keratin amino acids, Keratin hydrolysate
Synthetic · Hair Conditioning · EWG: 4
Plant-Derived Synthetic
Skin Conditioner
Hair Care
Amino Acid
Synthetic
Clean
Hair Keratin Amino Acids are the keratin amino acids obtained by the hydrolysis of human hair Science: Functions: Hair Conditioning, Skin Conditioning Safety Ratings: CIR: Safe as used EU Restriction: II/416
Effective at 3.0%
CAS #
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Form
Powder
See origin →
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
Keratin's structure was first identified in the early 20th century. Keratin amino acids became popular in hair care during the 1980s-1990s as a way to repair and strengthen damaged hair by mimicking the protein found naturally in hair fibers.
Skin Types
●all-skin-types
Best For
General
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%100%
Effective Range
CIR reported use: 0.0003-6 | 0.00001-0.5
Regulatory Agencies
Verified Feb 2026
Data: CosIng · EWG · CIR