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SODIUM STEAROYL CASEIN.

Valuable CAS 222400-24-0 / HAIR CONDITIONING, SKIN CONDITIONING, SURFACTANT - CLEANSING

Sodium Stearoyl Casein is a versatile milk protein derivative primarily valued for its skin and hair conditioning capabilities. It also functions as an effective emulsifier and emulsion stabilizer, contributing to the integrity of cosmetic formulations. Its properties suggest potential for moisturizing, protective, and soothing benefits to the skin.

Summary

Skin conditioning Emulsifying Emulsion stabilizing Moisturizing Soothing Sebum regulating

Science

Mechanism of Action

Derived from milk protein, Sodium Stearoyl Casein works as a conditioning agent for both skin and hair. It is believed to impart moisturizing, protective, and soothing effects, akin to other milk proteins. Additionally, it may assist in regulating sebum production and potentially reducing acne lesions. Its structure also allows it to serve as an emulsifier and stabilizer, similar to related ingredients like Sodium Caseinate, which exhibit high water absorption crucial for emulsion formation.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH 7 – 7
0 7 14

Stability

Based on studies of related Sodium Caseinate, optimal chemical stability with minimal proteolysis is observed around pH 7.0. Overall stability is influenced by pH, temperature, and ionic strength, specifically calcium ion (Ca2+) concentration.

Conflicts

  • High concentrations of calcium ions (Ca2+) can lead to aggregation, particularly around neutral pH (e.g., pH 7.5).
  • Water-soluble surfactants may displace caseins at interfaces, potentially impacting emulsion stability if the casein derivative is acting as an interfacial stabilizer.

Safety

Safety Profile

CIR Status
Not reviewed
Max tested
2%
Sensitization risk Low

While Sodium Stearoyl Casein has not been specifically reviewed by CIR or SCCS, the CIR Expert Panel deemed 16 bovine milk proteins and protein derivatives (including Sodium Caseinate and Sodium Hydrolyzed Casein) safe for cosmetic use. Related ingredients showed negative results in dermal irritation, ocular irritation, and sensitization tests. The maximum reported use concentration for related casein derivatives in leave-on products is up to 2%, with Sodium Caseinate specifically at 0.1% in leave-on face/neck products. Bovine milk proteins are generally recognized as safe (GRAS) for food, implying higher systemic exposure from food than from cosmetic use, further supporting its safety profile.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Unknown

Our Assessment

Verdict

Valuable

Sodium Stearoyl Casein is a valuable milk protein derivative offering broad skin compatibility, conditioning, and emulsion stabilizing properties, supported by a favorable safety profile based on related ingredients.

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