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SODIUM CARRAGEENAN.

Valuable CAS 9061-82-9 / 60616-95-7 / ANTISTATIC, BINDING, EMULSION STABILISING, FILM FORMING, VISCOSITY CONTROLLING

Sodium Carrageenan is a marine-derived polysaccharide primarily utilized in skincare for its multi-functional role as a thickening agent, emulsifier, and stabilizer. It enhances product texture while simultaneously offering humectant properties to hydrate the skin and form a protective, moisture-retaining film.

Summary

Emulsion Stabilising Film Forming Viscosity Controlling Humectant Moisturizer

Science

Mechanism of Action

This ingredient functions by improving the textural integrity of cosmetic formulations, preventing the separation of oil and water phases, and contributing to a smooth, desirable consistency. On the skin, Sodium Carrageenan acts as a humectant, attracting and binding water to boost hydration levels. It further forms a lightweight, invisible film that minimizes trans-epidermal water loss, leaving the skin feeling soft, supple, and moisturized. Preliminary research also suggests potential antioxidant and antiviral benefits, though these require further investigation in topical applications.

Research

Clinical Evidence

Insufficient-data confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

No data available to indicate common dusting practices or specific thresholds for Sodium Carrageenan in cosmetic formulations.

The Formula

Formulation

Solubility
Water
Optimal pH ≥7
0 7 14

Stability

Sodium Carrageenan exhibits stability in neutral to basic pH conditions but is susceptible to degradation in acidic environments. While all carrageenan types dissolve in hot water (above 60°C or 140°F), sodium salts are uniquely soluble in cold water. Its gelling properties are influenced by cations, with potassium ions enhancing kappa-carrageenan gels and calcium ions yielding softer, elastic gels with iota-carrageenan.

Conflicts

  • Acidic conditions (degrades)

Safety

Safety Profile

CIR Status
Safe as used
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel deems polysaccharide gums, including carrageenan, safe for use. While a specific maximum concentration for topical Sodium Carrageenan is not explicitly defined, it boasts a long history of safe use and is not known to cause adverse effects. Regulatory bodies such as the FDA, EU, EWG, and WHO recognize it as safe for personal care products. It is crucial to note that degraded carrageenan (poligeenan), associated with inflammation, is distinct and not used in cosmetic formulations.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

Sodium Carrageenan is a valuable cosmetic ingredient, offering robust formulation benefits as a texture enhancer and stabilizer, coupled with established humectant and film-forming properties for skin hydration, all within a well-documented safety profile.

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