No , vtiamn megadosing is not recommended by AFAA
No, Vitamin C is water solubule. That means that your body will flush away any excess Vitamin C when you urinate. This is incontrast with some vitamins, such as A, which can kill you if you take too much of it. Also note that megadosing on Vitamin C, while not dangerous, is a waste of money, since you're literally flushing most of it away.
It is because the water in your body, then it is not needed needs to go through all the intestines so by then, when it comes out as urine, there is dirt and other stuff in it. It means you haven't had enough water. Your urine is meant to be a light strawberry colour to a clear colour. + your brain works better when your hydrated, you can work better!