What is Pentylene Glycol? Pentylene glycol is part of the 1,2-glycol family of ingredients. The 1,2-glycols are characterized by the presence of two hydroxyl or alcohol groups on the first and second attachment points along the carbon chain. The carbon chain can vary in length; for example, propylene glycol, which has a chain length of … Continue reading Pentylene Glycol: Are Glycols Bad For Your Skin?