Originally published at: https://www.driphacks.com/advice/propylene-glycol-an-in-depth-exploration/
1. Introduction: What Is Propylene Glycol? Propylene Glycol (PG) is a synthetic organic compound belonging to the alcohol family. It is a clear, colourless, odourless, and slightly viscous liquid, widely used as a humectant, solvent, and preservative across food, pharmaceuticals, cosmetics, and industrial sectors. Despite its synthetic origins, propylene glycol is generally regarded as safe…