The body stores approximately 400 mg vitamin C, when taken orally it starts to excrete through the urine with doses between 60mg and 100mg, excretion increasing as the dose increases. Also as the dose increases the absorbancy through the gut wall decreases.Too much vitamin C causes diarrhoea. If a person has insufficient vitamin C then the mitochondria are unable to generate energy from fats, which may eventually make the mitochondria unable to generate energy from glucose. (Lane N. (2002) Oxygen: the molecule that changed the world pp 181-193, OUP.)