Science
Mechanism of Action
On the skin, Disodium Phosphate primarily acts as a buffering agent, effectively stabilizing the pH of cosmetic formulations. This pH balance is critical for maintaining skin health, mitigating potential irritation, and ensuring other active components function optimally. It also functions as a humectant, drawing water molecules to the skin, thereby providing a subtle moisturizing effect beneficial for dry or dehydrated skin types. Furthermore, it contributes to product stability by chelating metal ions that could otherwise degrade the formulation, and can also modify product viscosity for improved texture.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
This ingredient is a white, crystalline powder that is hygroscopic, meaning it readily absorbs atmospheric moisture, which can lead to caking during storage. Optimal stability is achieved when stored in cool, dry conditions, away from humidity. A 1% aqueous solution demonstrates a pH typically ranging between 8.0 and 11.0, reflecting its moderately basic nature and buffering capacity within this range.
Conflicts
- strong acids
- antipyrene
- chloral hydrate
- lead acetate
- resorcinol
- pyrogallol
- aluminum (mildly corrosive in solid form, reacts with solutions to form flammable hydrogen gas)
- zinc (reacts with solutions to form flammable hydrogen gas)
- galvanized iron (reacts with solutions to form flammable hydrogen gas)
- steel (mildly corrosive in solid form)
- brass (mildly corrosive in solid form)
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has affirmed Disodium Phosphate's safety for cosmetic use, concluding it is 'safe in the present practices of use and concentration in cosmetics' up to 2.9%, provided it is formulated to be non-irritating. The U.S. FDA classifies Sodium Phosphate forms as Generally Recognized As Safe (GRAS) for various food applications. It is widely considered non-toxic with a minimal risk of side effects, though rare instances of sensitivity or allergic reactions may occur. The Environmental Working Group (EWG) also designates a 'low' concern for irritation to skin, eyes, or lungs.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Disodium Phosphate is a valuable formulation aid, primarily ensuring product stability and optimal performance of other ingredients through pH regulation, while also offering subtle moisturizing and protective benefits for the formula itself.
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