Vitamin C has the effect of strengthening resistance. However, for many women who pursue beauty, vitamin C has another important role, which is whitening, and even many whitening products include vitamin C as one of the promotion points. So, how to intake vitamin C to really achieve the whitening effect? The answer is – it is more useful to take it internally than to apply it externally. Dong Xiuqin, chief physician of the Department of Dermatology of Guangdong Provincial People’s Hospital, said that, generally speaking, the amount of vitamin C taken by normal people through a reasonable diet every day is enough, and there is no need to add extra. Excessive intake can pose a threat to health. The vitamin C plays an indirect role in whitening The vitamin C is not only an indispensable component of the body, but also has the effect of strengthening resistance and whitening the skin. Why can vitamin C whiten? Dong Xiuqin explained that, strictly speaking, it is not vitamin C that makes the skin white. In the role of whitening, vitamin C actually plays an indirect role of pushing the wave. Skin tone on the one hand depends on the melanin in the skin, the root cause of its generation lies in tyrosinase, and vitamin C can inhibit the activity of tyrosinase to reduce melanin production, and also scavenge free radicals to reduce skin damage due to UV rays. Therefore, it also has the effect of improving the dullness of the skin. In addition, vitamin C can also promote collagen production. The dermis of the skin contains a lot of collagen, which is the source of moisturized, shiny and elastic skin, but collagen can be affected by oxidation and change, then the vitamin C in the tissue plays an antioxidant and anti-aging role, which can inhibit the generation of pigment spots to a certain extent. The external effect is small, and the internal is ideal. It is well known that melons and fruits are rich in vitamins, and there are many beauty loving MM who diligently use melon and fruit masks and other ways to apply to their faces in order to achieve the effect of whitening by means of external application. Some women also double-pronged, external and internal at the same time, still afraid of whitening effect is not hand to hand? Dong Xiuqin said, vitamin C is not really external internal double-pronged can be half the effort. In fact, the ordinary vitamin C skin is not able to absorb. Due to the “brick wall structure” of the skin, making the epidermis form a solid anti-lock, which is actually an important barrier function to maintain the health of the skin, for normal human skin, vitamin C is generally difficult to break through this barrier directly absorbed by the skin, and therefore, it is difficult to work from the outside. In order for vitamin C to promote the body’s whitening function, it is best to start by “eating”. Dong Xiuqin suggests that the daily intake of vitamin C is best taken from vegetables and fruits, as long as a balanced diet can basically meet the body’s needs, there is no need to add extra. But for people under stress, tension, insomnia and other bad emotions, because these emotions will make the body produce too many free radicals, need more vitamin C to its “capture and removal”, you can properly increase the intake of vitamin C. People with low intake of fruits and vegetables or irregular meals and imbalanced nutrition can also take medication containing vitamin C under the guidance of a doctor. Do you have these misconceptions? Since vitamin C is widely available in our food and the price of vitamin C supplements in the market is low, it seems to be an easy thing to use for beauty. Dong Xiuqin said, at present, for vitamin C whitening and use of the problem, many people have misconceptions, such as long-term or excessive use, is a threat to health. Myth 1: Eat more fresh fruits and vegetables rich in vitamin C can be whitened How much vitamin C can actually play a role depends on the digestion and absorption capacity of each person, so it can also be said that it varies from person to person. Not that the more you eat the more you absorb, everyone has their own absorption rate, and excess vitamin C will be metabolized in the body to oxalic acid, or combined with sulfuric acid to generate ascorbic acid-2-sulfuric acid by the urine discharge; another part can be directly excreted from the urine. It should be noted that many fruits, such as oranges, kiwis and lemons, are rich in vitamin C. Although vitamin C is widely found in vegetables and fruits, it is also an unstable water-soluble antioxidant with a short shelf life and is easily oxidized. For example, two hours after leafy green vegetables are picked, vitamin C is lost, and more than half of it is lost in half a day. At the same time, heating will also accelerate the loss of vitamin C, such as stir-fried vegetables will not have much vitamin C left. Therefore, for the absorption of vitamin C, the daily intake of sufficient amounts to play a role. Myth 2: Long-term consumption of vitamin C tablets can play a better role in whitening The intake of vitamin C is limited. Since vitamin C is acidic, taking large amounts can cause diarrhea, excessive stomach acid, gastric reflux, etc. Patients with stomach problems should be disabled. And long-term large amounts can also cause a significant increase in oxalate and urate in the urine, which can easily form kidney stones. The recommended intake of vitamin C for adults is 50-60 mg per meal. Myth 3: Vitamin C can make the skin whiter It should be emphasized that vitamin C does not have a whitening effect, but plays a role in inhibiting the formation of melanin. Therefore, at most, it can bring the skin tone back to normal level. If you have a dark complexion, it is unlikely that taking more vitamin C will make your skin whiter.