Ester C Night Cream a skin vitaliser?

my skin has started breaking out ,i was told by my father.he pointed out that how careless and carefree i have in protecting my skin against going dull and drab.i then realized that it was true and told my niegborhood aunt about how shoddy my skin had become over time and all this due to insensitivity shown on my part. she then said i need not worry and gave me the the solution of applying the  ester c night cream during night time while i sleep. i was interested that how does vitamin c help in this process of firming up skin ? what role does it have? does it seep down the skin pores and reach the dead skin skills and revive them?