Pentylene Glycol

Pentylene glycol is a lightweight humectant and solvent that pulls water into your skin and helps dissolve other ingredients so they mix properly in a formula. It's one of those behind-the-scenes workers that doesn't get much attention but shows up in a lot of products because it's good at its job. You'll find it in serums, toners, and moisturizers where it contributes to hydration without feeling heavy or sticky. It's also used in smaller amounts in makeup and sunscreen. The ingredient is well-tolerated by most skin types, though people with very sensitive skin might want to patch test first, as with anything new.