The vitamin C contained in natural food is different from the synthetic vitamin C.
In fruits and vegetables, ascorbic acid and rutin play a role in natural vitamin C. However, the synthetic vitamin C is a pure pharmaceutical preparation, which is far less effective than the natural vitamin C.
In addition, the dosage of synthetic preparations is often large, if taken for a long time, oxalic acid can be formed in the body. This is a potential threat to the formation of kidney oxalate stones. On the contrary, vitamin C in fruits and vegetables will not lead to excessive oxalic acid content in urine.