What it is
Dodecane is a straight-chain alkane with twelve carbons that is liquid at room temperature, low in viscosity, and volatile. In sunscreens it serves as a carrier and solvent that helps spread the product thinly and evaporates partly on application, contributing to a dry, non-greasy finish. It can also help dissolve oil-soluble UV filters and improve the cosmetic elegance of mineral formulas.
Safety & warnings
Used at cosmetic levels it is generally well tolerated, though as a volatile hydrocarbon solvent it may have a mild defatting effect that can feel drying on very dry or compromised skin.
Origin & sourcing
Synthetic or refined hydrocarbon; obtained from petroleum fractions, and increasingly available in plant-derived or fermentation-based grades.
Questions everyone asks
What is dodecane used for in sunscreen?
It is a light, volatile solvent that thins the formula, helps it spread evenly, and evaporates partly to leave a quick-drying, weightless finish.
Is dodecane the same as a silicone?
No. Dodecane is a hydrocarbon, not a silicone, though it can give a similar light, fast-spreading feel and is sometimes used as a hydrocarbon alternative to volatile silicones.