Congrats,
@xrayspex, on getting those mercury fillings out. Does that mercury accumulate in the body, and need to be detoxed somehow? I'm not an expert in any way; I have no mercury fillings...
Anyway, the benefit I noticed from vitamin C was simply: more energy. A noticeable amount. It was great to get a nice boost of energy from something as simple as vitamin C.
Have you heard the theory behind taking a large amount of vitamin C? Humans and other apes don't make vitamin C, we have to get it in our diet. Most other animals make it themselves. I read that goat will make around 10g of vitamin C in it's liver per day, and a lot more if it is sick or stressed. Humans are a lot bigger than goats, so the theory goes that we should supplement it, especially, with how most of us eat, we hardly get any otherwise.
I do suspect the woman in that article is trying to hawk some other wholefood supplements. Or maybe she is unaware that the GMO doesn't effect things on that molecular level once the corn has been synthesized down to C6H8O6. Or who knows, maybe there is some truth to it, and non-GMO stuff is better... usually, though, the rule is: before you take someone's advice, have a look and see what is motivating them to say a certain thing... as in, what are they selling, or getting commission for...
The trick to take plenty of vitamin C is to divide the dose, so you are only taking a small amount at once, otherwise it will just trigger the gut to empty. I know I can handle 3g four times per day, so I take that.
If you want to listen to some of Andrew Saul's stuff, there's plenty of it on YouTube.