Another question. If want to mix serum วิตามินซี by using the same formula and concentration as that of Skinceuticals Phloretin CF(to get the closest product) Does the staff have a formula and how to publish it?[/quote ] Recommended to try. See an example of how to mix. Vitamin CE Ferulic by adding Pure-Phloretin™ by dissolving in Ethoxydiglycol in the formula.Staff - MySkinRecipes