Supplements are typically chemically manufactured substances and are not even assimilated by the human organism.
Vitamin C is certainly one of the most important nutrients but even nowadays most people do not get the minimum RDA of 50mg (approximately equivalent to one orange).
Most of you will have heard the old wives saying 'an apple a day will keep the doctor away' . Well that saying is very true.
Without vitmain C your body will simply not function properly.