Glucono Delta Lactone (GDL), also known as gluconolactone, is supplied from China under the brands Rocket and Jungbunzlauer (JBL), and is typically packaged in 25Kg HDPE bags.

GDL is classified as a food additive with the E-number E575 and is commonly used as a sequestrant, acidifier, or curing, pickling, and leavening agent in various food applications. It is the lactone form of D-gluconic acid.

In its pure form, GDL is a white, odorless crystalline powder. It has been approved and marketed for use in products such as feta cheese, where it contributes to controlled acidification and texture development.