Also known as 'sour salt'. Citric acid is a natural acidic ingredient found in all citrus fruits and is used primarily in sausage making, pickling or canning to keep fruits from discoloring. Tip: Try adding some to your dishwasher to take the soap scum off your glasses. Also used to make phosphate drinks in the old soda fountains.This Product is Kosher. Our Citric Acid is Made In the USA.