Avoiding catching colds? Tips wanted

Vitamin C, along with all of the B vitamins are water soluable. As such mega dosing is pointless as your body will quickly excrete any exess out of your bloodsteam.
Please note, this is incorrect.
Your body will excrete all traces out of your system, this is why you need to ensure a daily intake of B & C vitamins.

This error does not change the fact that Mega Dosing is pointless though.