But it is hard for water-soluble vitamin C applied on the surface of the skin to be absorbed into the skin's pores. It is necessary to use phosphate lipid spheres that the water-soluble active ingredient can adhere to.
若只是把水溶性的維他命 C 塗在皮膚表面，其實很難滲入油質皮膚，必須藉由脂肪球將水溶性養分「包」起來。