An additive used in personal lubricants to maintain a consistent texture and consistency. In its pure form, it is a white powder.

GDL increases the acidity of water-based lubricants, and it can act as a pH-balancing agent or a preservative in some formulas. While it is commonly added to meat and dairy products, it is not derived from meat (in other words, GDL it is a vegan-friendly ingredient). GDL is regarded as a safe substance.