Butylene Glycol

Butylene Glycol (1,3-Butanediol) is a petroleum-derived diol that serves as both a solvent and humectant, distinguished by its ability to enhance the penetration and stability of active ingredients without leaving a heavy or sticky feel on skin. Formulators favor it over propylene glycol for its superior sensory profile—it provides excellent slip and a silky after-feel while being less likely to cause irritation. Its antimicrobial properties also allow it to function as a preservative booster, reducing the required concentration of traditional preservatives in formulations.