Vitamin C is good for you, but 20x the daily dosage is not necessary. Best case scenario, your body dumps the 19x it doesn't need. Worst case scenario, it accumulates and causes you harm by depleting other nutrients, or stressing your body. For most vitamins it is the former, but overdosing on some can cause serious problems.
I had a vitamin B complex that has 30x the daily riboflavin (B2), every time I took a tablet, I'd spent the next day urinating bright fluorescent (highlighter) yellow pee. It was the uber-excess of riboflavin, there was so much of it, it was turning my pee a different color. At best, all it was doing was overworking my kidneys.
The argument you put forth is akin to saying, "
water is good for you, no reason not to drink 20 gallons a day". Vitamins were very usefull, even necessary 100 years ago when diets were so limited people died of preventable disease (scurvy, rickets, etc.), but today your diet should suffice. If it makes you feel better, take a "100% of each" multivitamin. But 5000% of a specific vitamin is totally unnecessary and could harm you.
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