Propylene Glycol (E 1520)

Last reviewed October 19, 2026

In plain words: Propylene glycol (E 1520 / INS 1520) is a synthetic compound (propane-1,2-diol) used as a carrier solvent and to help foods hold moisture. It carries flavorings and colors and is found in some baked goods and dressings. It is not the same thing as ethylene glycol.

Identity

Propylene glycol. Number: E 1520 / INS 1520. Function: carrier solvent, humectant. Typical foods: flavoring and color carriers, some baked goods and dressings. What it is: a synthetic diol (propane-1,2-diol); not ethylene glycol.

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This page is for general education. It is not medical advice and does not replace advice from your doctor, pediatrician, allergist or registered dietitian. Research changes; we review these pages when new evidence or rules come out. Last reviewed October 19, 2026.