Best For Skin Types
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Usage Frequency
As part of formulated product
What Is Sodium Phosphate?
Sodium phosphate is a salt derived from phosphoric acid. In skincare formulations, it serves as a buffering agent—a component that helps stabilise and maintain the pH of a product, preventing it from becoming too acidic or alkaline over time.
As a buffering ingredient, sodium phosphate works behind the scenes rather than directly on the skin. It is present in only a small percentage of skincare products, typically where pH stability is important for formula efficacy or safety.
How It Works
Sodium phosphate works through its buffering capacity. When added to a formulation, it can neutralise excess acid or base, keeping the pH within a narrow, stable range. This is important because many skincare actives—such as vitamin C or certain exfoliating acids—require a specific pH to remain stable and effective on skin.
Clinical Evidence & References
Sodium phosphate is well established as a pharmaceutical and cosmetic buffering agent, with a long history of safe use in formulations. However, there is limited direct research on its specific effects when applied topically in skincare products. Its role is primarily functional—maintaining formula integrity rather than providing direct therapeutic benefit to skin.
How to Use
As a buffering agent, sodium phosphate concentration and effectiveness are optimised during product formulation. There are no specific usage guidelines for consumers; simply use the product as directed by the manufacturer.
Safety & Precautions
Frequently Asked Questions
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