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POTASSIUM POLYPHOSPHATE.

Valuable CAS 68956-75-2 / CHELATING

Potassium Polyphosphate is a versatile inorganic salt primarily employed in skincare for its powerful chelating and pH-buffering capabilities. It actively supports skin health by stabilizing formulations and maintaining the skin's optimal acidic environment, while also contributing to hydration and antioxidant defense.

Summary

Chelating Buffering Moisturizing Antioxidant Adsorption Enhancer Preservative Booster

Science

Mechanism of Action

This ingredient functions primarily as a potent chelating agent, neutralizing detrimental metal ions that can degrade cosmetic stability and aesthetic appeal. It acts as an effective pH regulator, assisting in preserving the skin's natural acidic mantle (pH 4.7-5.0), thereby preventing shifts that might lead to dryness, irritation, or excessive sebum production. Furthermore, Potassium Polyphosphate enhances moisture retention for softer skin, exhibits antioxidant properties by combating free radicals linked to aging and environmental damage, and is suggested to optimize the absorption and longevity of other active ingredients. Some related phosphate forms can also boost preservative efficacy.

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 6.4 – 7.2
0 7 14

Stability

Polyphosphate solutions demonstrate optimal stability when maintained near a neutral pH, specifically between 6.4 and 7.2, and at temperatures below 25°C. Elevated temperatures and more acidic pH levels detrimentally affect the stability of the phosphate species, leading to hydrolysis and potentially forming insoluble metaphosphates upon prolonged heating.

Synergies

  • Enhances adsorption of other active ingredients
  • Potentially boosts preservative efficacy (certain forms)

Conflicts

  • High temperatures
  • Low pH (acidic conditions)

Safety

Safety Profile

CIR Status
Insufficient data
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) noted some unassessed potential for skin/eye/lung irritation, indicating 'weight of evidence unknown/unassessed'. However, Environment Canada classifies it as not expected to be potentially toxic or harmful, and broader reviews on related phosphates suggest a low potential for inhalation toxicity. It is widely recognized as a safe food-grade ingredient, and INCIDecoder rates its irritancy and comedogenicity as low.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

Potassium Polyphosphate is a valuable multi-functional ingredient that stabilizes formulations, supports skin pH balance, enhances hydration, and offers antioxidant benefits across all skin types.

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