Yes, vitamin C is important. You can take too much and injure yourself. Water is even more important. You can drink too much and injure (or kill) yourself. Oxygen is even more important. Too much will injure or kill you. People love to overreact, even when it does more harm than good. "Drinking water is good? I will drink two gallons A DAY! It will flush toxins! Improve my skin! Help me lose weight! And if that doesn't work - FOUR gallons a day!"