Ingredient dictionary

Disodium Pyrophosphate

Also listed as: Disodium diphosphate, Sodium acid pyrophosphate

Disodium Pyrophosphate is a sodium salt related to phosphoric acid. It mainly works as a chelating agent, which binds stray metal ions, and as a pH adjuster. It is on the label of 2 products in our library. Checked against our library November 6, 2026.

What Disodium Pyrophosphate does

Binds stray metal ions in a formula
Helps keep pH steady
Helps protect ingredients from metal-driven changes

Disodium Pyrophosphate is made from phosphate salts. Manufacturers heat these salts so that two phosphate units join together and release water. The result is a white powder that dissolves in water and gives a mildly acidic solution.

Formulators use it mainly as a chelating agent. Chelators grab metal ions such as calcium and iron, which can otherwise cause cloudiness, odd color, or scent changes. It also helps hold pH steady in a formula. On its own it does not change the feel of a product much, so it works quietly in the background.

Good for

Suits formulas that need a steady pH and protection from metal ions, such as cleansers and hair products.

Frequently asked questions

Is Disodium Pyrophosphate safe to use?

Disodium Pyrophosphate is generally well tolerated in the small amounts used in cosmetics. If you have sensitive skin, patch test a new product first and stop using it if you notice redness or stinging.

Is Disodium Pyrophosphate the same as tetrasodium pyrophosphate?

Not quite. Disodium Pyrophosphate has two sodium atoms. Tetrasodium Pyrophosphate has four and behaves differently in a formula. Both are phosphate salts used for similar jobs, such as binding metal ions.