Hello, were you aware that vitamin C is an essential nutrient involved in the repair of tissues and certain neurotransmitters?
No I wasn't. I know it is good to prevent colds.
Yes, it is part of essential human nutrition that is necessary to support human life and health.
Vitamin C is definitely one of the many vitamins essential to good health along with regular exercise. 
One disease that vitamin C is known to prevent is scurvy. This can be prevented with vitamin C containing foods or by taking dietary supplements.