Is it okay to take 2000mg of Vitamin C per day?

Yes. Linus Pauling used to recommend 3, 000-5, 000 mg of Vitamin C per day on a regular basis. For those with cancer or viral infections, he recommended doses in excess of 10 gm per day. Many physicians recommend therapeutic doses of vitamin C as high as 2 gm every hour, to "bowel tolerance"--i.e., until gastritis or diarrhea results.