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Moumoujus

SOYAMIDOPROPYL DIMETHYLAMINE.

Avoid CAS 68188-30-7 / SURFACTANT - CLEANSING, SURFACTANT - EMULSIFYING

Soyamidopropyl Dimethylamine is a fatty acid amidopropyl dimethylamine derivative recognized for its conditioning and antistatic properties. It functions as a zwitterionic surfactant and emulsifier, helping to stabilize formulations and reduce dryness by forming a protective film.

Summary

Antistatic Agent Hair Conditioning Skin Conditioning Surfactant Emulsifier Foaming Agent

Science

Mechanism of Action

This ingredient functions as a zwitterion, meaning it carries both positive and negative charges depending on pH. At low pH levels (typically 3.5-4.0), its tertiary amine group becomes protonated, forming cationic ammonium salts. This cationic character contributes significantly to its antistatic and conditioning effects on hair and skin, where it forms a thin film to reduce dryness. It also acts as a surfactant and emulsifier, stabilizing oil and water phases, and provides good foaming properties, particularly useful in rinse-off products.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Both
Optimal pH 3.5 – 4
0 7 14

Stability

Optimal performance for cationic conditioning and emulsification occurs within a pH range of 3.5-4.0. Viscosity can decrease significantly above pH 4.2. For cleansing formulations, a pH closer to 6.0-6.5 may be used. Care must be taken during formulation to prevent the formation of nitrosamines.

Conflicts

  • Anionic surfactants at low pH

Safety

Safety Profile

CIR Status
Safe with restrictions
Sensitization risk Moderate

The CIR Expert Panel considers Soyamidopropyl Dimethylamine, among other fatty acid amidopropyl dimethylamines, safe for cosmetic use provided it is formulated to be non-sensitizing. The primary safety concern is the potential for sensitization arising from impurities such as 3,3-dimethylaminopropylamine (DMAPA) and amidoamine; thus, formulations must rigorously minimize these sensitizing impurities. While no specific maximum concentration is defined for Soyamidopropyl Dimethylamine, related compounds like cocamidopropyl dimethylamine have reported maximum use concentrations up to 6.5% in skin cleansing products. The CIR report from 2019 noted this ingredient was 'not in current use'. There are no specific SCCS or FDA restrictions beyond general cosmetic regulations for its use in Europe.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
No Oily
No Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Verdict

Avoid

While conditionally deemed 'safe with restrictions' by CIR when formulated to be non-sensitizing, the primary concern lies in the potential for impurities to cause sensitization, coupled with its 'not in current use' status in 2019 and an 'avoid' rating from INCIDecoder, suggesting it is not a preferred ingredient for precision skincare.

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