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As a food additive, citric acid is used as a flavoring and preservative in food and beverages, especially soft drinks. Citrate salts of various metals are used to deliver those minerals in a
biologically available form in many dietary supplements. The buffering properties of citrates are used to control pH in household cleaners and pharmaceuticals. In the United States
the purity requirements for citric acid as a food additive are defined by the Food Chemical Codex