There is no such thing as “taking a vitamin C tablet at bedtime”. Vitamin C tablets should not be taken every day unless prescribed by your doctor. Vitamin C is an essential vitamin for the human body, which can be involved in the synthesis of collagen to maintain the structural integrity of human tissues; at the same time, as an enzyme involved in the metabolism of a variety of substances; itself is also a very good antioxidant. Vitamin C is widely found in vegetables and fruits. The recommended daily dose of vitamin C for a healthy adult is only 100mg, while kiwifruit has a vitamin C content of 65mg/100g, and there are many other fruits that contain more vitamin C than kiwifruit, so it is recommended that vitamin C be supplemented through food. In case of vitamin C deficiency, vitamin C tablets can be taken orally. Vitamin C can be used for the prevention of scurvy, and can also be used as an adjunctive treatment for various acute and chronic infectious diseases and purpura. It is not advisable to overdose on vitamin C tablets for a long period of time, as this may increase the risk of urate, cysteinate or oxalate stones, and there is also a risk of post-discontinuation scurvy when the medication is suddenly stopped. Therefore, healthy people do not need additional vitamin C supplements; if there are symptoms of deficiency, please use vitamin C tablets under the guidance of a doctor.