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SODIUM PHOSPHINATE.

Questionable CAS 7681-53-0,10039-56-2 / ANTIOXIDANT, CHELATING

Sodium Phosphinate, also known as Sodium Hypophosphite, acts as a dual-function ingredient in cosmetic formulations, primarily providing antioxidant and chelating benefits. It is designed to enhance product stability by inhibiting oxidation and neutralizing metal ions that can degrade other active compounds. While offering these protective qualities, its inclusion in precision skincare requires careful evaluation due to limited cosmetic-specific safety assessments.

Summary

Antioxidant Chelating

Science

Mechanism of Action

This compound primarily operates as a potent reducing agent, actively preventing the oxidation and subsequent deterioration of oxygen-sensitive ingredients within a formulation. Simultaneously, it functions as a chelating agent, effectively binding to and deactivating metal ions. By sequestering these ions, Sodium Phosphinate mitigates their capacity to catalyze adverse reactions, thereby preserving product integrity and visual appeal.

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 6 – 8
0 7 14

Stability

Sodium Phosphinate is stable under typical ambient conditions but exhibits hygroscopic properties, readily absorbing moisture from the air. Its aqueous solutions, typically a 5% concentration, maintain a neutral pH between 6 and 8. The compound decomposes at elevated temperatures exceeding 200°C or within hot alkaline solutions, leading to the liberation of toxic and flammable phosphine gas. To prevent explosive incidents, evaporation of its hot solutions should be performed under reduced pressure.

Conflicts

  • Strong oxidizing agents (potential for explosion)
  • High heat/fire (decomposition and phosphine gas release)
  • Hot alkaline solutions (decomposition and phosphine gas release)

Safety

Safety Profile

CIR Status
Not reviewed
Sensitization risk Moderate

The Cosmetic Ingredient Review (CIR) and the European Scientific Committee on Consumer Safety (SCCS) have not specifically reviewed Sodium Phosphinate for cosmetic applications, and there is no specific FDA cosmetic status (e.g., GRAS). While generally considered safe for most skin types, individuals with sensitive skin should exercise caution, as direct skin contact may lead to irritation, redness, and pain. Should irritation occur, affected areas should be promptly flushed with soap and water.

Your Skin

Skin Compatibility

No Normal
No Dry
No Oily
No Sensitive
Irritancy Unknown
Comedogenicity Unknown

Our Assessment

Verdict

Questionable

Despite its demonstrated antioxidant and chelating benefits for formulation stability, the absence of specific cosmetic safety reviews by CIR or SCCS, coupled with documented potential for skin irritation in sensitive individuals, renders Sodium Phosphinate a questionable ingredient for precision skincare applications.

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