INGREDIENT GLOSSARY • Humectant
AT A GLANCE
A multi-functional ingredient that can function as humectant, solvent, and slip agent.
Butylene glycol, like its cousin propylene glycol, is a multi-talented addition to any skincare formula. It’s a great humectant, meaning it draws water towards itself and helps hydrate and plump the skin. It’s a solvent, so it helps ingredients stay dissolved in a formula. And it’s what’s known as a slip agent, meaning it can help a formula spread more easily over the skin.