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Moumoujus

COCO-HYDROXYSULTAINE.

Valuable / ANTISTATIC, CLEANSING, HAIR CONDITIONING, SKIN CONDITIONING, SURFACTANT - CLEANSING, SURFACTANT - FOAM BOOSTING, VISCOSITY CONTROLLING

Coco-Hydroxysultaine is an amphoteric surfactant widely employed in skincare to enhance the mildness of cleansing formulations. It meticulously stabilizes surfactant structures, minimizing the potential for skin irritation while simultaneously boosting foam and refining product texture.

Summary

Surfactant Foam Booster Viscosity Enhancer Hair Conditioning Skin Conditioning Antistatic

Science

Mechanism of Action

This amphoteric surfactant operates by stabilizing surfactant micelles, thereby preventing their breakdown into irritating monomers that could disrupt the skin's natural barrier lipids. It precisely lowers the charge density of micelles formed by anionic surfactants, leading to a significantly gentler cleansing action. Furthermore, it functions as a foam enhancer, viscosity builder, and conditioner, effectively reducing the irritation potential of other surfactants within a formulation.

Research

Clinical Evidence

High confidence
Effective range N/A
Optimal

N/A

Key findings

  1. 01 Human Repeated Insult Patch Tests (HRIPTs) conducted at a 2.5% concentration indicated that Cocamidopropyl Hydroxysultaine did not act as a dermal sensitizer, though slight to moderate irritation was observed after repeated induction patches. Further rabbit studies, at a higher concentration of 41.5%, demonstrated no skin irritation, underscoring its general mildness.
  2. 02 The highest reported maximum use concentration in rinse-off skin cleansing products is 11.5%, while for leave-on face and neck skincare products, it is 2.5%.

Transparency

Dusting Analysis

Not commonly dusted

As a liquid surfactant, Coco-Hydroxysultaine is not associated with dusting concerns in cosmetic formulation.

The Formula

Formulation

Solubility
Water
Optimal pH 4.5 – 7.5
0 7 14

Stability

Coco-Hydroxysultaine maintains its efficacy and stability across a broad pH range of 4.5 to 7.5. It exhibits excellent tolerance to hard water conditions and demonstrates robust low-temperature stability, preventing formulation deterioration, thinning, or stratification.

Synergies

  • Enhances the mildness and significantly reduces the irritation potential of anionic surfactants.
  • Improves foam quality, stability, and product viscosity when combined with other surfactants.

Conflicts

  • Potential for N-nitroso compound formation if co-formulated with N-nitrosating agents, particularly due to possible amine/amide impurities like 3,3-dimethylaminopropylamine (DMAPA). Adherence to Good Manufacturing Practices (cGMPs) is critical to mitigate this risk.
  • High humidity and elevated temperature storage conditions can compromise its long-term stability and performance.

Safety

Safety Profile

CIR Status
Safe as used
Max tested
11.5%
Sensitization risk Low

The CIR Expert Panel concluded that Cocamidopropyl Hydroxysultaine is safe in cosmetics under current practices of use and concentration, with a maximum recommended concentration of 11.5%. Concerns exist regarding N-nitrosation reactions with amine/amide impurities, necessitating manufacturers to implement cGMPs to limit N-nitrosatable impurities. Regulatory bodies, including the FDA and EU Cosmetics Regulation, deem it safe within specified concentration limits.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

Coco-Hydroxysultaine is a valuable amphoteric surfactant, expertly enhancing the gentleness and performance of cleansing formulations across all skin types, with a strong safety profile when correctly formulated.

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References

Sources