I've learned a lot about vitamin C in my chemistry class. It's absolutely fascinating. It used to prevent pirates from getting scurvy, by eating lemons.
Ohh yeah, I love citrus too so I'm a fan.
Many people take very large doses of vitamin C to prevent things like a cold but the  United States Institute of Medicine recommends against it.
Oh like those powder supplements?
Yeah, just like those High C supplement powders. The daily recommended amount is about 90 mg/day but some of those supplements are closer to 2000mg/day.
I would
Evidence does not support taking it prevents colds, but there appears to be some minor evidence that it may slightly shorten the length of a cold. I generally don't worry about it though vitamin C is generally tolerated very well.
I meant to say that I would've thought that the remaining vitamin C would just be urinated out and therefore making it harmless but I guess not.
No you're right, extra Vitamin C is generally urinated out, but for a small number of people can cause some side effects like gastrointestinal discomfort, headache, trouble sleeping, and flushing of the skin. Vitamin C is generally very safe in high doses unlike A which will kill you in high doses.
Hmm I had no idea, honestly.