I hope you don't mind, but... a little excerpt from a book I rely upon very heavily.
"The healing of wounds depends on the formation of connective tissue, which, although made of protein, cannot be synthesized without vitamin C. Hundreds of studies have shown that the speed of healing and the tensile strength of the connective tissue are directly proportional to the amount of vitamin C obtained; and that if large amounts are taken, dramatic results can be produced, whereas a lack of vitamin C allows incisions to break open.
This vitamin also accelerates the formation of new blood vessels at the site of injury and around clots which may block veins. It activates many enzymes used in healing, speeds the formation of new proteins, and helps to prevent hemorrhages to the extent that without it a minor injury can result in a major loss of blood. Its detoxifying action at a time when medications must be given and various harmful substances are formed from destroyed cells is particularly important. A single dose of any one of a number of drugs caused the blood of animals to take eight times longer to clot than before the drug was given, and the prolonged clotting time continued for two weeks, yet this effect was entirely prevented when vitamin C was allowed with the drug.
The combined stresses of injury, pain, x-rays, medications, injections, tube feedings, catheterizations, and immobilization can induce a vitamin C deficiency at lightning speed even when seemingly large amounts are obtained. For example, 300 mg of vitamin C daily have proved to be far too little to be effective. A physician recently told me that his patients showed amazing improvement when given 500 mg every two hours for the first several days after any form of injury."
"Extremely large amounts of vitamin C will sometimes cause diarrhea, indicating that more is being taken than is needed; if this tendency is noticed, the amounts should be immediately decreased."
I needed massive doses of vit C at one time in my life, and when I had taken 4000mg in a single day, I did get diarrhea. Reducing the amount caused that problem to clear right up.
Generally, I take about 1,000mg daily... if I'm on the ball and take my vitamins like a good girl!