If that's the case why do many vitamin manufactures have 500mg and 1000 mg caps? Other things like calcium etc have lower doses in capsules. Linus Pauling a nobel prize winner was the one who said 1000 mg every hour if you have a cold
The manufactures want to make money.
If I really need to go on I can find every top MD on this topic. Please read all of it.
Taking any more than about 200 milligrams per day is likely a waste of money anyway, according to a landmark study by Mark Levine of the NIH. Levine's group found that the body's cells can't absorb more than about 100 milligrams per day, and the concentration of vitamin C in the blood begins to level off at a dose of 200 milligrams per day. The study appeared in the April 1996 issue of Proceedings of the National Academy of Sciences.
The message is that large doses simply go to waste, says Balz Frei, PhD, director of the Linus Pauling Institute. "Above a certain threshold, you urinate out most of what you take in," says Frei.
The panel found no evidence of serious side effects from large doses of vitamin C, but recommended a maximum dose of 2,000 milligrams per day because of the possibility of diarrhea, an inconvenience that usually passes quickly. As a precaution, anyone with hemochromatosis, thalassemia, or a history of kidney disease should shun high doses, Jacob says. So should anyone taking blood thinners or estrogen or who has a history of renal stones. In such cases, make sure you get your doctor's advice before considering higher doses of vitamin C.
Contrary to Pauling's claims, the panel concluded that high doses of vitamin C probably won't protect you from getting a cold, either, though they may shorten the length of your suffering slightly.
Neither the government's recommendations nor the reversal by Pauling's own institute has dampened the enthusiasm for vitamin C among true believers
