I own the entire line of Arbonne NutriMinC RE9 Products. I love them all! The serum lasts a long time becuase you do nut need much. As a matter of fact my issue is that I can't control the amount better since it is a pump. I gentlely press down on the pump and most of the time i get the desired amont without fully going down all the way. Anyway, the actual product I use as directed before applying the moisturer --- during the so=ummer when my face is more greasy I use the serum in leui of the moisturizer. The serum makes my skin smooth. I would recommend it.