Vitamin C (VitaminC), also known as ascorbic acid, is one of the 13 essential trace elements in the human body and is mainly found in fresh vegetables and fruits, such as tomatoes, spinach, oranges, oranges and dates. However, it cannot be synthesized by the body itself and must be taken in from outside. When vitamin C is lacking, the body’s ability to defend itself against the outside world is weakened and it is more likely to suffer from respiratory diseases, such as colds and upper respiratory infections. In addition, since vitamin C assists the body in absorbing iron, vitamin C deficiency may lead to anemia. Scurvy can occur in severe vitamin C deficiency. Therefore, in clinical practice, vitamin C is usually taken for the treatment and prevention of scurvy, and as a nutritional supplement for other chronic wasting diseases. Some beauty lovers and health professionals take vitamin C orally for a long time to whiten their skin or prevent diseases. Although vitamin C is theoretically an important free radical scavenger, it is effective in scavenging many reactive oxygen species in the body, promotes metabolism, and plays a role in supporting the immune system. Vitamin C can also block the process of melanin production and reduce oxidized melanin to achieve a light spot whitening effect. However, long-term consumption of large amounts of vitamin C may cause gastrointestinal side effects such as abdominal pain and diarrhea, and may occasionally cause urate, cysteine salt or oxalate stones, and may also cause diabetes, adverse blood system reactions, and allergic reactions. And the effect of taking vitamin C solely for the purpose of whitening and disease prevention is also very limited. Therefore, although vitamin C is good, but also need to take the right way, do not blindly abuse.