1,2-Hexanediol ( Super-Purified, Odorless) Solvent Alternative solvent Propylene Glycol and Butylene Glycol . 1,2-Hexanediol Can help retain water well. (water-binding, humectant) and help resist pathogens. It can act as a preservative booster. Butylene Glycol in solubility Glabridin 40% ?