Doctor insights on:
What Is The Most Vitamin C I Should Take 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. ...Read more
Why so much: There's no clear benefit to such high doses. In the end, this is a water soluble vitamin so you're unlikely to run into problems, as you should pee most of the extra out. But, at least for men, high dose vitamin C has been shown to increase the risk of kidney stones. You're probably better of keeping the dose in the range of 1000mg or less to be safe. ...Read more
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. ...Read more
How much vitamin C is allowed per day? I have a cold and would like to take vitamin C to reduce symptoms. Is 2000 a day ok?
Safe to take 40,000!: There is no know "toxicity" to oral vitamin C though too much can cause loose stools. There is some concern that taking large amounts of Vit C on a longterm basis can increase risk of kidney stones but the evidence is contradictory: http://tinyurl.com/ho9dccc Vit. C won't help your cold much without high doses. I advise 2000 mg every hour until you get loose stools- see http://tinyurl.com/lqevelt ...Read more
Is it okay to take more than one vitamin C tablet per day on top of a multivitamin if it says on the vitamin C bottle to only take one a day?
Is it safe to take vitamin c tablets 1000 mg per day while you are on venlafaxine and clonazepam ?
Vit. C: Unless otherwise advised by your doctor, should be ok. ...Read more
Is it alright to take vitamin c before and/or after a vaccine? I take 2,000-2,500mg per day. Does immune system need to be free of medicines?
No issue: No need to delay/suspend vitamins when getting vaccines. ...Read more
I read that taking high doses of vitamin C can affect birth control effectiveness. I am on seasonique and take vit. C supplement about 560 mg per day?
Unlikely: A study has shown that the increase in availability of estrogen in women taking a lot of vitamin c is not of any clinical significance. Vitamin c does not decrease the effectiveness of the pills, although huge doses may cause mild symptoms of excess estrogen. ...Read moreSee 1 more doctor answer
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