Imo such huge doses of vitamin c can be dangerous, especially if taken over long periods of time. Vitamin c acts as a anticoagulant and as a diuretic. In such huge doses it may promote kidney stone formation. It may also cause a great incease in iron absortion and iron perhaps iron overload. While I lake the idea of taking plenty of vitamin c, my definition of plenty is around a gram or two a day, not 20 grams a day. Take b vitamin supplemts , calcium, magnesium and zinc. Also take bioflavonoids.