Dipotassium Phosphate

What is Dipotassium Phosphate?

Dipotassium phosphate is the inorganic dipotassium salt of phosphoric acid, with the chemical formula K2HPO4. It exists as a white, water-soluble powder produced through chemical synthesis from potassium hydroxide and phosphoric acid. In cosmetics, it falls under buffering and pH-regulating agents, appearing in products such as cleansers, serums, lotions, and shampoos. This compound functions by donating or accepting protons to maintain a consistent pH environment, which is crucial for ingredient stability, preservative activity, and skin compatibility during use. As a buffering agent, it resists pH shifts from external factors like air or skin contact. Additionally, it inhibits corrosion on metal surfaces in pumps or containers by forming protective layers, preventing degradation, off-odors, or discoloration. Its role ensures formulations remain effective and safe throughout shelf life and application.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 1 View on EWG →
PubChem View on PubChem →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Corrosion inhibitor
Reduces corrosion reactions on metal surfaces in packaging or applicators, helping prevent rust, off-odors, and metal-related discoloration over time.
PH adjuster
Raises or lowers pH to the target range, supporting ingredient performance, preservative efficacy, stability, and user comfort.
Anticorrosive
Protects metal components and packaging by reducing corrosion, helping maintain product integrity and preventing discoloration or contamination from metal surfaces.
Buffering agent
Maintains the pH stability of a formulation.

Benefits

Maintains steady pH levels to support formula performance and comfort.

Protects packaging from corrosion for product integrity.

Enhances stability of active ingredients and preservatives.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
Users of pH-sensitive formulations like toners or serums.
Those with confirmed hypersensitivity to phosphates.
Individuals preferring stable, long-shelf-life products.
Individuals advised by dermatologists to limit inorganic salts.
People with all skin types seeking reliable everyday skincare.
Users of phosphate-free products for personal reasons.

Safety Notes

  • Recognized as safe for cosmetic use by regulatory bodies.
  • Low skin irritation potential in typical concentrations.

Frequently Asked Questions about Dipotassium Phosphate

What is dipotassium phosphate used for in skincare?

It acts as a pH adjuster, buffering agent, and corrosion inhibitor to keep formulas stable and packaging protected.

Is dipotassium phosphate safe for sensitive skin?

It carries low hazard ratings and minimal irritation risk in cosmetics.

Does it affect product shelf life?

Yes, by preventing pH shifts and corrosion for better long-term stability.