Sodium Hydrolyzed Casein

Sodium Hydrolyzed Casein 1
Sodium Hydrolyzed Casein 2
Sodium Hydrolyzed Casein 3
Sodium Hydrolyzed Casein 4
AKA: Casein Protein, Hydrolyzed Milk Protein
Synthetic
Skin Conditioner
Hair Care
Not Clean
Casein hydrolysates, sodium salts
CAS #
222400-26-2
Form
Powder
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
Casein (milk protein) has been used in skincare preparations for centuries; the sodium salt form was developed in the 20th century. Used as a film-forming and skin conditioning agent that provides mild protein-derived benefits.
EWG
4
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Skin Types
●all-skin-types
Best For
Dryness
Pregnancy & Breastfeeding Safe
Yes
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory1 listing →
🛡️Safety-assessed1 review →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: CosIng · EWG · CIR