Whenever vitamin C is discussed, you can be sure someone will bring up excretion and associate it with some low number (typically a government RDA). But how do you think aspirin or any other medication gets removed from your body? What if you are thirsty and you take a large drink of water? Do you notice that not too long afterward you have to urinate? Does this mean you drank too much water?
There is a field of study called pharmacokinetics
. Experts in this field are able to determine proper dosages of medications based on how long the desired substance is sustained in the blood stream. This is why your medicine will have directions such as how much and how often to take it. You see, things don't just get excreted like flushing your toilet, it takes time. The exact time is determined by studying and observing things under different conditions.
Vitamin C happens to have a very short half life in the human blood stream, typically 30 minutes under normal circumstances. Under adverse circumstances it can actually be much less (so actually more can be used). I actually take about 4 to 6 grams (that's 4000 to 6000 mg) per day. But I don't take it all at once. I spread it out through the whole day. I do this because the half life is so short.
Vitamin C is involved with the body's creation of keratin
, a protein which is used in fingernails, hair, skin, and many other things. I have been taking lots of vitamin C for several years and I have also notice that my nails appear to be much healthier as a result.
If you would like to learn more about vitamin C, I recommend this excellent book