Natures Flavours Sodium Citrate is a salt that comes from citric acid which, in turn, comes from natural fruits and vegetables, especially citrus fruits. In many old cookbooks Sodium Citrate is also called sour salt because of its salty, and mildly tart taste. Natures Flavours carries a couple of other common sour salts, such as citric acid, and potassium citrate. Typically Natures Flavours finds that people use Sodium Citrate in recipes that make jams, gelatins, beverages, and dairy products, such as ice cream, yogurt, cheese, and milk.