Is it safe to take 1, 000mg of vitamin C per day?

Yes. This amount is a reasonable dose, although recommendations can vary widely depending on source or reason for taking it. The best way to get any vitamin is through your diet. If you take additional vit c be aware many otc supplements add it, so the total dose can get high fast. High doses of vit c usually cause diarrhea first, and yellow urine.Megadoses should be used cautiously. Vitamins are drugs.