Sodium citrate is chiefly used as a food additive, usually for flavor or as a preservative. Its E number is E331. Sodium citrate is employed as a flavoring agent in certain varieties of club soda. Sodium citrate is common as an ingredient in Bratwurst, and is also used in commercial ready to drink beverages and drink mixes, contributing a tart flavor.
Sodium citrate is sometimes used as an acidity regulator in drinks, and also as an emulsifier for oils when making cheese. It allows the cheeses to melt without becoming greasy. Sodium citrate can be used as a flavouring (typically Club Soda) or as a food additive.