Citric acid is a natural, chemical substance and it can be found in big quantities in lemons and other citrus fruit and in smaller quantities in strawberries, pineapples and kiwis. In normal conditions it is a colorless, crystalline powder. It is used as a flavoring and preservative in food and drinks, especially in non-alcoholic drinks. Its code as a food additive is E330. It is safe to be used in food and it is not carcinogenic. It helps jams to thicken and it prevents fruits from turning brown in fruit salads. It can be used instead of lemon.