What it is
Isododecane is a hydrocarbon (organic compound containing carbon and hydrogen only) ingredient.
What it does
Isododecane is an emollient. Like all hydrocarbons used in cosmetics, it help prevent water evaporating from the skin.
It is also a solvent used in many makeup removers and, because evaporates easily, it is used as a fragrance ingredient.
In addition, it improves the spreadability of a product.
Isododecane isn’t irritating unless there is a pre-existing allergy or prolonged exposure to it.