It is normal to eat 1000mg of vitamin C per day is more, because the Chinese Dietary Guidelines recommend a daily intake of vitamin C of about 100mg. The dangers of eating too much vitamin C per day: 1. Eating too much vitamin C can cause metabolic disorders of calcium in the body, which in turn can cause a high risk of kidney stones, bladder stones and urinary tract stones. 2. It can easily lead to absorption disorders of other nutrients, because vitamins are often absorbed together in similar ways. If too much of a particular vitamin is consumed it can affect the absorption of other vitamins, so taking 1000mg of vitamin C per day is relatively much. It should be more appropriate to follow the recommendations of the dietary guidelines, roughly around 100mg per day.