Disodium Phosphate

Proteins & Amino AcidsCAS: 7558-79-4

This is what the ingredient is.

Disodium phosphate (DSP) is a sodium salt of phosphoric acid used as an emulsifier and pH buffer.

Here is why it shows up on the label.

Used in processed cheese, evaporated milk, and as a buffering agent. Helps proteins dissolve smoothly.

Here is what food agencies say.

The FDA lists it as Generally Recognized as Safe. group ADI for phosphates. Permitted with specifications.

Here is what research has found.

Part of phosphate group reviewed by an FAO/WHO expert committee. Safe at food-use levels. Contributes to phosphorus and sodium intake.

Here are a few things worth knowing.

Contributes to sodium and phosphate intake. Those on phosphate-restricted diets should monitor.

Sources

  • FDA GRAS List
  • EFSA Scientific Opinion
  • JECFA

How to read this page

We publish plain facts about this ingredient so a label is easier to read. This is not medical advice, and it is not a recommendation to buy, avoid, or use anything. For a personal health question, talk with a clinician who knows your history.

v1.0Updated 9/12/2026