The minimum recommended intake for an adult is 40mg, however larger doses have been used in research.  It is considered that an individual can absorb approximately 250mg of vitamin C at any one time, consequently as vitamin C is a water-soluble vitamin, any excess would leave the body in urine. For general health 100-500mg daily can be supportive of skin, gums, teeth, bones, blood vessels, psychological and central nervous system function. However, at the onset of an infection up to 2000mg daily may be beneficial.