Know Your Ingredients: 1,2 Hexanediol What it is 1,2 Hexanediol is a clear colourless to light yellow liquid. What it does 1,2 Hexanediol is a solvent: it helps to dissolve other substances. Side effects 1,2 Hexanediol is generally considered to be safe. (Source: cosmeticsinfo.org) Like this post? Tell your friends!