Gluconolactone widely used in food industry Glucono delta-lactone, also known as gluconolactone, is a food additive with the E number E575 used as a sequestrant, an acidifier, or a curing, pickling, or leavening agent. It is a lactone of d-gluconic acid. Pure GDL is a white odorless crystalline powder.

In skincare used as humectant, anti-ageing skincare. Has antimicrobial activity and may be used for acne-prone skin, oily skin creams formulations.