Proprietary Essential Oil Blend (No Phthalates)/No Aluminum Chlorohydrate 100% Vegan Propanediol is different than Propylene Glycol in three major ways. Structure Physical & Chemical Properties Source and Manufacturing Process Propanediol is mainly derived from a sustainable and renewable corn sugar fermentation process. Propylene Glycol is mainly synthesized from Propylene Oxide, a petrochemical. Manufacturing corn-derived Propanediol emits up to 40% less greenhouse gases than chemically-derived Propylene Glycol¹. Corn-derived Propanediol uses up to 35% less non-renewable energy than chemically-derived Propylene Glycol¹. ¹According to life cycle analysis from design data by Dupont Tate & Lyle