Does health care and whitening also cure all diseases？ Vitamin c means： refuse to kill.

　　Vitamin C is an essential nutrient for us to keep healthy. From the needs of the body to whitening health care, the function of vitamin C has also been spread more and more "powerful". Because of its antioxidant effect, vitamin C is highly expected in whitening. In daily life, we often think that oral ulcers and gingival bleeding are caused by lack of vitamin C; Even the barbs on the hands are related to vitamin C deficiency. Is this really the case?

　　Oral ulcers and bleeding gums are caused by lack of vitamin C; If you love long barbs on your hands, you should eat more vitamin C… … Do you often hear such advice in your life? Many people regard vitamin C as a panacea for all diseases. Is vitamin C really so "divine"? Some people even think that even if you can’t cure the disease, it’s always harmless to supplement a little more vitamin C. Is this really the case?

　　Myth 1: Eating a lot of vitamin C can turn white.

　　Everyone has a love of beauty. As the saying goes, one white covers a hundred ugliness. No, because vitamin C has antioxidant effect, many beauty lovers regard it as a good whitening product and take it in large quantities. Some people think it has whitening effect, while others say it has little effect. What is the truth?

　　In this regard, Li Heng, director of the Dermatology Department of Hubei Provincial Hospital of Traditional Chinese Medicine, said in an interview with the Science and Technology Daily reporter that vitamin C, also known as ascorbic acid, has the nature of acid and strong reducibility, and is an antioxidant. As we know, the root of skin blackening is melanosis, and melanin is secreted by dopa. When dopa secretes melanin, dopa must be converted into baquinone, and the role of vitamin C can reduce baquinone into dopa and prevent the generation of melanin. According to this mechanism, vitamin C has whitening effect. In addition, because vitamin C has antioxidant effect, it can promote the formation of collagen, rejuvenate the skin, thus delaying the aging of the skin and indirectly whitening the skin.

　　"But it doesn’t mean that the more you eat, the better. It has dosage requirements. If you take a large amount of vitamin C for a long time, it will hurt your body, because vitamin C is acidic, making the urine acidic, and it is easy to form urinary calcium oxalate stones and kidney calculi in the body. " Li Heng stressed that at the same time, high-dose vitamin C can resist the anticoagulant effect of heparin and dicoumarin, leading to thrombosis, which makes patients with cardiovascular and cerebrovascular diseases more prone to cerebral infarction (stroke); Vitamin C and food containing vitamin B12 can be ingested at the same time, which can destroy a considerable amount of vitamin B12, and after a large amount of vitamin B12 is destroyed, people are prone to anemia.

　　Ruan Guangfeng, director of the Science and Technology Department of the Food and Nutrition Information Exchange Center, said that some people say that vitamin C has good antioxidant activity and can inhibit tyrosine from being activated, so that tyrosine will not become melanin and can play a whitening role. There is some truth in this statement, but there is actually no particularly sufficient evidence.

　　"However, vitamin C is the synthetic raw material of collagen that makes up the skin, which is good for the skin. Therefore, it can be considered that vitamin C supplementation may be beneficial to the skin, but the whitening effect may not be as effective as expected. " Yan Guangfeng said.

　　Myth 2: Oral ulcer and gingival bleeding are caused by lack of vitamin C.

　　In life, gum bleeding is almost encountered by everyone. In the case of fatigue and irregular life, gum bleeding often occurs when brushing your teeth. Some people think that bleeding gums are a sign of a lack of certain vitamins. Is it true or not?

　　On this issue, a dentist interviewed by a reporter from Science and Technology Daily said that although a long-term serious lack of vitamin C will indeed lead to gingival bleeding and redness (the "scurvy" that sailors suffered from in the past was the reason), unless they don’t eat foods containing vitamin C such as vegetables, fruits and milk for two or three months in a row, except for a few people who are caused by systemic diseases such as blood diseases, most gingival bleeding is the manifestation of gingivitis.

　　Vitamin C is an acidic organic substance with anti-bleeding effect. When the human body is seriously deficient in it, it will lead to gum bleeding. However, all gingival bleeding cannot be completely attributed to vitamin C deficiency. Modern medicine believes that recurrent oral ulcers are closely related to the immune system at first. Some patients show immune deficiency, while others show autoimmune reaction. Due to various factors, the normal immune system of human body produces immune response to its own tissue antigen, which causes the destruction of tissue and causes the disease. Furthermore, oral ulcer may be related to some diseases or symptoms, such as gastric ulcer and duodenal ulcer caused by digestive system diseases. In addition, anemia, partial eclipse, indigestion, mental stress and high work pressure often cause frequent attacks of oral ulcer.

　　Misunderstanding 3 lack of vitamin c fingers will grow barbed

　　In winter, some people are prone to grow barbs on their hands. Many people think that this is because of the lack of vitamin C. Just eat more fruits. Is this really the case?

　　"Finger barbs have nothing to do with vitamin C deficiency." Li Heng said that the long barbs of fingers are keratinized protrusions around nails, and many people will pull them off by themselves. After pulling them off, there will be keratin defects in some areas, accompanied by pain. The main reason for barbs is that the skin is dry, and the keratin skin will become warped when it is dry. At this time, barbs will be formed; Bad eating habits, malnutrition caused by trace element deficiency, picky eaters or partial eclipse are also easy to form barbs; Tearing is an irregular injury, and the incorrect tearing method will lead to local skin damage, but it is easier to form barbs.

　　It can be seen from the above that the formation of barbs is not closely related to vitamin C. Li Heng suggested that after the barb appears, it must not be pulled off, and it should be cut off regularly with nail clippers, which can reduce the damage to the skin. At the same time, attention should be paid to applying hand cream to moisturize the skin in time to keep the local skin moist.

　　Shu Chang, a resident of dermatology department of Peking Union Medical College Hospital, said that finger barbs are usually not related to vitamin deficiency, but are caused by physical friction or excessive hand washing. The finger barb is called perionychial barb, and the perionychial skin where the perionychial barb is located is slightly different from other skin of the hand. This part of the skin lacks hair follicles, dermatoglyphics and sebaceous glands, and is very thin, which often causes various inflammations, chemical stimuli and allergic reactions. The formation of perinail barbs is mainly due to the separation of cuticle because it is too dry. The stratum corneum is the surface layer of thin dead skin and the first barrier of the skin. There is a layer of sebum on the surface of the stratum corneum, which is a natural moisturizing agent, which can reduce the evaporation of water in the stratum corneum, ensure its proper water content, and make the stratum corneum closely adhere to the underlying skin.

　　The sebum on the skin surface is removed by soap, detergent or physical friction, which will lead to the loss of protection of the stratum corneum and the drying and peeling of the stratum corneum due to excessive evaporation of water. It can be seen that long barbs have nothing to do with vitamin C.

　　Myth 4: Synthetic vitamin C is not as good as natural vitamin C.

　　"It’s a three-point poison of medicine" and "synthetic is certainly not as good as natural". People who have bought vitamin C often hear such remarks, so they often spend a lot of money to buy "natural" vitamin C, and manufacturers produce vitamin C products with different flavors and claim that their effects are different. Is there really such a big gap between these products?

　　Indeed, when you go to the drugstore, you will find that the price of vitamin C ranges from several yuan to hundreds of yuan, and the styles are also varied, including effervescent tablets, chewable tablets and buccal tablets. In this regard, some experts pointed out that the hospital’s two dollars of vitamin C is generally pure vitamin C, which is purely from the perspective of supplementing vitamin C and is a medicine; Most of what pharmacies buy are health care products, which are different from medicines in terms of purification process and added auxiliary materials, which also leads to the price difference. But in the final analysis, under the premise of the same content of vitamin C, there is no difference in efficacy between medicinal vitamin C and health care product vitamin C.

　　"There is no obvious difference in vitamin C. Fresh fruits and vegetables contain a lot of vitamin C. There is no need to supplement them specially, and they don’t have to eat them every day. Eating too much is not good for the human body." Li Heng said. (Reporter Fu Lili)