SkinCeuticals Custom D.O.S.E. Serum SkinCeuticals Custom D.O.S.E Serum ($195) is an in-office system that allows you to create a formula that meets every one of your skin goals. To start, you fill out a questionnaire with guidance from a dermatologist. Then a machine mixes your serum. Here's a list of the dermatologist offices that offer the service. Image Source: SkinCeuticals SkinCeuticals Custom D.O.S.E Serum $195 from skinceuticals.com Buy Now