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I read up on this because I had a really bad sinus infection a couple months ago and found myself taking "Emergen-C" every morning, which advertises "1000% your daily value of Vitamin C". Immediately after my sinus infection cleared up the virus stuff started, so I kept taking it for a while.

From what I read, at least with Vitamin C, you have to get into the 2000% range before there start being negative side-effects.

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I take as much as 20 grams a day with no side-effects. It can take your stomach awhile to get used to that much but once it has adjusted its fine.

The other thing I've always heard is that taking more than the recommended amount is pointless, because your kidneys filter it out. I definitely wouldn't take the time to adjust to an even higher dose. I was mainly only taking the dose I was because I didn't want to try and subdivide the little packets.

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