dipotassium phosphate

A synthetic salt that helps to adjust and maintain the pH of water-based and water soluble cosmetic formulas. Dipotassium phosphate is also used in foods as a buffering agent to improve food texture, where it has GRAS (generally recognized as safe) status.

References for this information:
https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFRSearch.cfm?CFRPart=182

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