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Health whitening also cures all diseases? Vitamin C says: refuse to kill
Vitamin C is an essential nutrient for our health. From the body's needs to whitening and health care, the function of vitamin C has also been spread more and more "strong". Because of its antioxidant effect, vitamin C has high hopes for whitening. In daily life, we often think that oral ulcers and bleeding gums are caused by lack of vitamin C. Even barbed hands are related to vitamin C deficiency. The fact is really Is that right?
Cavity ulcers and bleeding gums are caused by a lack of vitamin C; if you have long spines on your hands, you should eat more vitamin C ... Do you often hear such suggestions in your life? Many people regard vitamin C as a panacea for everything. Is Vitamin C really that "god"? Some people even think that even if you ca n’t treat the disease, it ’s harmless to add more vitamin C. Is this really the case?
Vitamin C can turn white
Heart of beauty in everyone. As the saying goes, one hides all ugliness. No, because vitamin C has anti-oxidant effect, many beauty-loving people regard it as a good whitening product and take it in large quantities. Some people think that it has a whitening effect, and some people say that it has little effect. What is the truth?
In response, Li Heng, director of the dermatology department of Hubei Provincial Hospital of Traditional Chinese Medicine, said that vitamin C, also known as ascorbic acid, has acidic properties, has strong reducing properties, and is an antioxidant. We know that the root of skin darkening is melanin deposition, and melanin is secreted by dopa. When dopa secretes melanin, dopa must be converted into quinone, and the role of vitamin C can reduce quinone to multiple Bar, to prevent the production of melanin. According to this mechanism, it can be seen that vitamin C has a whitening effect. In addition, because vitamin C has an antioxidant effect, it can promote the formation of collagen and rejuvenate the skin, thereby delaying the aging of the skin and indirectly giving the skin a whitening effect.
"But it's not that the more you eat, the better. It has a dosage requirement. If you take a lot 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 calcium oxalate stones in the body. And kidney stones. "Li Heng emphasized that at the same time, large doses of vitamin C can fight the anticoagulant effects of heparin and dicoumarin, leading to thrombosis, which makes patients with original cardiovascular and cerebrovascular disease more prone to cerebral infarction (stroke); Vitamin C and vitamin B12 ingestion at the same time can destroy a considerable amount of vitamin B12, and vitamin B12 after a large amount of damage, making people susceptible to anemia.
Ruan Guangfeng, director of the Science and Technology Department of the Food and Nutrition Information Exchange Center, said that some claims that vitamin C has good antioxidant activity and can inhibit the activation of tyrosine, so that tyrosine will not become melanin and can whiten Role. This statement makes some sense, but in fact there is no particularly sufficient evidence.
"However, vitamin C is a synthetic raw material for the collagen that makes up the skin, and it is still good for the skin. Therefore, it can be considered that vitamin C supplementation may have certain benefits on the skin, but the whitening effect may not be as effective as expected." Ruan Guangfeng said .
Mouth ulcers, bleeding gums
Caused by lack of vitamin C
In life, gum bleeding is encountered by almost everyone. Under the circumstances of fatigue and irregular life, gum bleeding often occurs when brushing your teeth. Some people think that bleeding gums is a manifestation of a lack of certain vitamins. Is it true?
In this regard, the dentist said that although a chronic severe deficiency of vitamin C does cause bleeding and swelling of the gums (the "scurvy" suffered by crew members on voyages in the past is the reason), unless they do not eat vegetable fruit milk for two or three consecutive months And other foods containing vitamin C, otherwise, except for very few people due to systemic diseases such as blood diseases, the vast majority of gum bleeding is the manifestation of gingivitis.
Vitamin C is an acidic organic substance that has an anti-bleeding effect. When the body is severely deficient, it can cause bleeding gums. But not all gum bleeding can be blamed entirely on vitamin C deficiency. Modern medicine believes that recurrent oral ulcers are first and foremost closely related to the immune system. Some patients show immunodeficiency, and some patients show autoimmune response. Due to various factors, the normal immune system of the human body has an immune response to self-tissue antigens, causing tissue destruction and disease. Oral ulcers may be related to some diseases or symptoms, such as gastrointestinal ulcers, duodenal ulcers, etc. In addition, anemia, partial eclipse, indigestion, mental stress, and high work pressure often cause frequent occurrence of oral ulcers.
Fingers lacking vitamin C can cause barbs
In the winter, some people are prone to barbs on their hands. Many people think that this is due to lack of vitamin C. Just eat more fruits. Is this really the case?
"Long fingernails have nothing to do with the lack of vitamin C." Li Heng said, long fingernails are keratinized protrusions around the nails, and many people will pinch off by themselves. After the pinch off, there will be keratinous defects in the part. Pain, the main reason for the appearance of barbed skin is dry skin, dry horny skin will rise, and barbs will form at this time; poor eating habits, malnutrition caused by lack of trace elements, picky eaters or partial eclipse, are also easy to form Puncture; tearing is an irregular injury. Incorrect tearing can cause 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 chopped off. Use nail clippers to cut it off regularly to reduce skin damage. At the same time, pay attention to applying hand cream that moisturizes the skin in time to keep the local skin moist.
Shu Chang, a resident in the Department of Dermatology, Peking Union Medical College Hospital, said that finger thorns are usually not related to vitamin deficiency, but caused by physical friction or excessive hand washing. The barb on the finger is called a nail barb, and the skin around the nail is slightly different from other skin on the hand. This part of the skin lacks hair follicles, no skin lines and sebaceous glands, and is very thin. Inflammation, chemical irritation, allergic reactions. The formation of barbed nails is mainly due to the separation of the stratum corneum which is too dry. The stratum corneum is the thinnest layer of dead skin and is the skin's first barrier. There is a layer of sebum on the surface of the stratum corneum, which is a natural moisturizer, which can reduce the moisture evaporation of the stratum corneum and ensure its proper moisture content, so that the stratum corneum and the underlying skin fit tightly together.
Soap, detergent, or physical friction removes the sebum on the skin surface, which will cause the stratum corneum to lose its protection, and the moisture in the stratum corneum will dry out and peel off due to excessive evaporation of moisture. It can be seen that long barbs have nothing to do with vitamin C.
Synthetic vitamin C is not as good as natural
"It's a drug that is three points poisonous" "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 a variety of different flavors Vitamin C products and claiming different efficacy, is there really such a big gap between these products?
Indeed, when you go to the pharmacy, you will find that the price of vitamin C ranges from a few yuan to hundreds of yuan, and the style is also varied, including effervescent tablets, chewable tablets, lozenges, etc. In this regard, some experts pointed out that vitamin C for two dollars in hospitals is generally pure vitamin C, which is purely from the perspective of vitamin C supplementation, and is a medicine; most of the pharmacies buy health products, and the health products are purified from the process The added excipients are not the same as medicines, which also leads to price differences. But after all, under the premise of the same vitamin C content, there is no difference in efficacy between medicinal vitamin C and health products vitamin C.
"There is no obvious gap between various vitamin C. Fresh fruits and vegetables contain a lot of vitamin C. There is no need to supplement it specifically, and you don't need to eat it every day. Eating too much is not good for the human body." Li Heng said.