Denatured alcohol: the problem with alcohol is primarily the denaturation; that is, the way it is made undrinkable, which is a legally required way of handling alcohol when it is used in cosmetics. There are four ways to denature: by adding phthalates, essential oils, Bitrex or isopropyl alcohol.

Phthalates are known to be harmful and should therefore be avoided. Isopropyl alcohol, Bitrex and essential oils are officially accepted as harmless substances, but here as a consumer you have to make up your own mind about what you want to avoid. Bitrex is also called denatonium benzoate and does not immediately appear to be harmful. https://www.helseklinikken-agersted.dk/kosmetikogindholstoffer