Glucono delta-lactone (GDL) is a naturally occurring organic acid that is produced by the oxidation of glucose. It is often used as a food additive and dietary supplement, including in some protein powders, due to its potential health benefits.
In protein powders, GDL may be added as a leavening agent to help the product rise and become lighter in texture. It is also sometimes added as a source of acidity to enhance the flavor and taste of the product.
Additionally, GDL has been shown to have potential therapeutic benefits for certain medical conditions, including high blood pressure and osteoporosis. It is thought to work by increasing the absorption of minerals, such as calcium, in the body.
GDL is generally considered safe when consumed in recommended amounts.