Megadosing vitamin C typically means simply having the vitamin administered through an IV straight into the bloodstream rather than taking a supplement orally or including the vitamin consciously through your diet. Having vitamins administered intravenously allows for the vitamin to work within the body at an accelerated rate, offering substantial benefits from the vitamins much faster than if you were to wait for the bloodstream to absorb the vitamin naturally. Effects will be noticeable much faster, and the benefits will be maximized as a much higher quantity of the vitamin makes it to the bloodstream if it is administered directly rather than having to wait for the body to naturally absorb it.