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Moumoujus

SODIUM ALGIN SULFATE.

Avoid CAS 9010-06-4 / HUMECTANT

Sodium Algin Sulfate, derived from brown algae, functions primarily as a potent humectant, drawing moisture to the skin and forming a protective barrier to enhance hydration. It also acts as a versatile cosmetic adjuvant, optimizing product texture, stability, and delivery.

Summary

humectant moisturizer film-forming viscosity controlling emulsifying stabilizing binding

Science

Mechanism of Action

Sodium Algin Sulfate functions as a humectant by attracting and binding water, thereby increasing skin hydration and maintaining suppleness. It forms a protective, moisture-retaining film on the skin's surface, preventing transepidermal water loss. Beyond its direct skin benefits, it serves as an effective thickening agent, emulsifier, and stabilizer, contributing to optimal product texture and stability.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Key findings

  1. 01 A study in rats indicated that sodium alginate, when used as a therapeutic filler, exhibited long-term volumizing effects and sustained skin uplift, with decreasing granulomatous reactions over time. This suggests potential for deeper tissue interaction, though its direct topical efficacy for cosmetic hydration is not quantified by this research.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH 5 – 9
0 7 14

Stability

Sodium Algin Sulfate solutions maintain stability within a pH range of 5 to 9. Its viscosity is pH-dependent, generally increasing as pH decreases, reaching maximum gelation around pH 3-3.5, making it suitable as a gelling agent in acidic formulations.

Conflicts

  • Formulation with Vitamin B3 (Niacinamide) and Vitamin C (L-ascorbic acid) should be approached with caution, as it may lead to the degradation of these active ingredients.
  • Dissolution challenges may arise in the presence of other hydrating compounds like sugars, starches, proteins, or monovalent cation salts exceeding 0.5% concentration, necessitating extended mixing.

Safety

Safety Profile

CIR Status
Safe as used
Sensitization risk Low

Sodium Algin Sulfate is generally recognized as safe (GRAS) for cosmetic and personal care applications, confirmed as non-toxic and well-tolerated. It holds FDA approval as a food additive and is deemed noncytotoxic. European authorities (EFSA, COT) classify it as having low toxicological concern. While EWG highlights potential contamination considerations, product purity can be assured through specific verification processes.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Avoid

Despite its recognized safety in general use and humectant properties, the high reported irritancy and comedogenicity suggest potential adverse skin reactions, leading Moumoujus to advise avoidance in precision skincare formulations.

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