Xu Yi shook his head and said, "I don't study this thing, I don't know why, but just now I remembered a property of protein, and guessed that this may be the reason why this is added to this cosmetics and facial masks, just talk about it." ”

Liu Liping smiled: "You say, even if you are wrong, what can you do, let's not chat, plus learn some knowledge from you." ”

Xu Yi said: "Protein dissolved in water can form a gel, gel has a good water retention effect, I think it is possible to add collagen to this for moisturizing, and collagen raw materials are extensive, easy to obtain, and no matter what kind of animal the structure of collagen is similar, it is not easy to cause allergies, which may also be the reason for the use of collagen in cosmetics." ”

"That's right, didn't you say you can't absorb it, so why do people have allergies to this seaweed seed?"

Xu Yi naturally had a conjecture, but when Liu Liping asked, he still answered directly: "First of all, let's say that your thing is collagen, but it is difficult for any macromolecular organic compound to have a single structure, and there are often many isomers, and the same is true for collagen. As he spoke, Xu Yi raised his finger and pointed at the acne on Liu Liping's nose, "Even this skin is not monolithic, it is inevitable that the stratum corneum in some places is relatively weak or even damaged, just like the stratum corneum on your nose If you really zoom in on the outside of the acne, I am afraid that the continuity is not complete." Even because the skin has a high water content, it will increase the permeability of the skin. In such a situation. Even something as large as collagen may not come into contact with the cells under the stratum corneum. Taken up by normal cells. ”

"Isn't this still nourishing the skin?"

Xu Yi shook his head: "It is not a protein made by the human body itself, or even just a human protein with inconsistent histocompatibility, which often has a certain danger for human tissues with normal immune function. When the immune system is abnormal, the body may even produce rejection of the proteins it manufactures, which is most typical of autoimmune diseases such as lupus erythematosus, which requires the use of immunosuppressants to prevent the occurrence and deterioration of the immune response. The same thing. For example, the reason why immunosuppressants are used in long-term and high-dose doses during organ transplantation is to avoid the body from rejecting the transplanted organ. It doesn't take much antigenic substance to cause allergies, it's like a person can eat two catties of shrimp in one meal, if from the perspective of energy supply and absorption and utilization, the energy that can be provided to a normal adult is actually only a few hours, which is not even as much energy as the same amount of glucose can provide. However, if you are a person with a seafood allergy, eating a shrimp with only a little bit of xenoprotein may cause a very severe allergy. ”

"Therefore, this allergy and nutrition should actually be looked at separately, such a small amount of protein through the stratum corneum. It is not impossible to achieve the process of nutrition for the cells, and it may even be due to the lack of necessary transporters on the cell surface and the lack of sufficient decomposition enzymes in the cells, so that the cells cannot absorb the protein, but this trace amount of protein is used to activate the immune system. It is more than enough to express an allergic reaction. ”

Liu Liping knew this time, and made this mask by herself "like this......"

Looking at Liu Liping's face full of disappointment, Xu Yi smiled: "You should feel lucky." This collagen cannot be absorbed through the skin, otherwise. There is still a chance of this allergy, and the beauty department of any regular medical institution will test for allergy before injecting collagen. Otherwise, it is easy to inject this thing, but it will be difficult to get it out, and this collagen injection is valid for almost one year. ”

"That's right. ”

Remembering the advertisement he saw on TV before, Xu Yi then asked: "For another example, does SOD Xiao Liu know what it is?"

Liu Liping nodded: "I know, superoxide dismutase, Xiaobao sees you every day, who doesn't know this advertisement." ”

"Do you know what superoxide dismutase does?"

Liu Liping said proudly: "I really know this, superoxide dismutase, can help the human body reduce oxygen free radicals, can alleviate the damage of ultraviolet rays to the skin, right?"

"That's right, this knowledge is very good, at least this advertisement is not in vain. ”

"That's it!"

Xu Yi said: "Superoxide dismutase is found in the vast majority of organisms, and even the homology of this thing is quite high, and the composition of superoxide dismutase in plant cells and superoxide dismutase in animals is not very different, and there are very few allergies." ”

"No wonder there are a lot of these things in cosmetics, and this whitening effect must be quite good. ”

"However, I regret to tell you that this superoxide dismutase also does not enter the human body through normal skin. ”

"No, don't they all say that Dabao is good?"

Xu Yi smiled. "Enzymes are also macromolecular proteins, and the molecular weight of superoxide dismutase is about 30,000, so it cannot penetrate the stratum corneum and enter the deep cells. When I was a student, I checked the relevant information, and there was no research on the absorption of superoxide dismutase in the skin of Tongguò. ”

Liu Liping smiled and said, "Third child, this has not been studied at all, so it can't prove that this thing can't be absorbed, right?"

Yan Peimin shook his head and said: "Wrong, if it can really be absorbed, there will be a lot of reports on this side, and there will even be more reports on the different absorption rates of superoxide dismutase of various origins. ”

"Why?"

Yan Peimin said: "After all, this kind of report is very beneficial to cosmetics companies, just like many drugs are not short of this kind of clinical application report, profit is the best motivation for research, so the third child thinks that the lack of a report proves that it cannot be absorbed is right." It can only be assumed that this absorption route was abandoned after people started the study, either it could not be searched by the skin, or the amount that could be ingested did not reach the actual value, so the research was terminated. ”

Xu Yi nodded and said: "I didn't find the report of the human body in the information I searched, but there are several studies on the real yàn of mice, and the real yàn confirmed that after superoxide dismutase enters the digestive tract of mice, there are certain decomposition products that may enter the body through the digestive tract of the guò, thereby inducing the acceleration of the production of superoxide dismutase in the body, but I have not seen the research report on the human body, so the results of the absorption of superoxide dismutase by the human body through the digestive tract are not yet known. ”

"Moreover, superoxide dismutase is not a skin-specific substance, and the main way for the human body to obtain energy is through the oxidation reaction that occurs on the mitochondria, which is also the main storage site of superoxide dismutase in cells. Therefore, there are a large number of superoxide dismutase in various tissues and organs of the human body, which must also be imagined that the superoxide dismutase taken orally will definitely not be distributed to the skin in a directional manner, and it will not be able to achieve the effect of beauty, and if the superoxide dismutase is synthesized too much for a long time, it is difficult to say whether it will cause any adverse effects on the human body. ”

"Ah, what Xiaobao sees every day is not true?"

"That's not true, superoxide dismutase is really important in the human body, and in vitro has also proved that this thing plays an important role in scavenging free radicals, but they will never and cannot tell you that this thing will definitely not be absorbed. ”

The fat man also said: "Cosmetics advertising and health care products, and even drug advertising is a kind of associative advertising, like cosmetics, it is generally to make a beauty, pose, and then introduce the product, which is nothing more than to make you think of such a result: 'Look at me using these things, and then now I look so young, so beautiful, ......' But the real effect, I'm afraid that only their pockets are bulging because of this advertisement." ”

Xu Yi nodded with a smile and said: "That's the case, for example, those celebrities talk about beauty and beauty, but in fact, they are often behind it for various commercial purposes, do you think they are really like us, teaching you knowledge?"

"Even if they endorse the cosmetics, can you believe that they must have used these things, or have they only used these things in their lifetime? Putting a bloody knife next to you doesn't really prove that you have killed people with this knife, why do those beauties put cosmetics on the side, but a few dozen seconds of advertising, you believe that she is really beautiful because of this thing?" Celebrities are beautiful, it can be said that three points depend on genetics, and seven points depend on dressing, haven't you seen the photos of those celebrities who have never worn makeup, and they all look like their fathers don't love their mothers, which also proves a point, how can the cosmetics they use have any effect?"

Xu Yi also sighed and said: "It can be said that in this regard, this cosmetics advertisement is definitely misleading consumers. ”

"That's okay, I saw a little greasy Internet celebrity on the Internet a few days ago, this person always writes some advertorials to recommend things in the online store, and many believe her words, after buying things in the store and using them, their faces are allergic. There was a face that was as rotten as a monkey's buttocks, and there was not even a production license on the packaging of the cosmetics that those people showed. Then, the fat man looked at Liu Liping again, and then asked: "You said that whether it is a celebrity or an Internet celebrity, you are a stranger to you, just if these people say something, these women will believe it, isn't this still brain-dead?" (to be continued......)