Ingredient dictionary

Isododecane

Isododecane is a light, branched oil made only of carbon and hydrogen, mainly used as a solvent and skin-softening oil that helps formulas spread smoothly. It is on the label of 70 products in our library. Checked against our library November 6, 2026.

The catch: none for most people; check the full product list if your skin reacts easily.

What Isododecane does

Dissolves and carries other oil-soluble ingredients
Gives a light, non-greasy slip
Helps formulas dry quickly
Adds a smooth, silky feel

Isododecane is a branched hydrocarbon, which means it is made only of carbon and hydrogen atoms. It is produced by a chemical process that links small building blocks into a longer, branched chain and then adds hydrogen, which makes it more stable. The end result is a clear, nearly odorless liquid.

Formulators use it mainly as a solvent. That means it dissolves other oil-loving ingredients, such as waxes and some UV filters, so they blend evenly. In sunscreens it helps keep filters spread through the formula. In makeup removers it helps loosen long-wear and waterproof makeup. It spreads fast, leaves a soft, light feel, and is silicone-free.

Good for

Suits styling products, sunscreens and makeup removers that need a light, fast-drying oil base.

Be careful if

Nothing in particular for most skin types.

Frequently asked questions

Is isododecane safe?

Isododecane is widely used in cosmetics and is generally well tolerated by most skin types. Like any ingredient, a small number of people may react to it, so patch testing a new product is a sensible habit.

Is isododecane a silicone?

No. Isododecane is a hydrocarbon, not a silicone. Silicones contain silicon and oxygen in their backbone, while isododecane contains only carbon and hydrogen. Many people who avoid silicones choose products with it as a silicone-free option.