The advantages of styling hair gel are strong fixing force and quick drying. There are two kinds of it: strong viscosity and weak viscosity. Strong viscosity, strong fixation, easy hair styling, obvious outline lines and full texture; Weak viscosity, good moisturizing performance, can make hair have healthy luster, soft and natural hair, and also has a certain hair fixing effect, so it is often used as a styling agent.
High-quality styling hair gel is made of volatile raw materials (such as polyvinylpyrrolidone). After use, hair is easy to set, oil-free and pollution-free. In addition, products often contain hair care film-forming substances, which can form a very thin protective film on the hair surface, so that the hair can be shaped and maintain its original breathability. After using styling hair gel, the hair is full of healthy luster and elasticity.
The harm of hair gel
In recent decades, the proportion of boys born in Britain suffering from cleft palate has increased rapidly. Fertility experts suspect that this is closely related to the frequent use of hair gel by mothers.
According to the BBC, a study by Imperial College London University found that pregnant women's exposure to hairdressing products, such as hair gel, mousse and styling water, may increase the risk of hypospadias for baby boys. This disease will seriously affect urination function and even destroy fertility. "If adult men use hairdressing products for a long time, it will also do great harm to fertility." The researchers added.
It is understood that this survey is divided into two parts. First, the researchers interviewed 4,765,438+0 mothers of boys with hypospadias and more than 400 mothers of healthy boys. After analyzing their occupation, health status and living habits, it was found that pregnant women who frequently contacted hair gel in the first three months of pregnancy were 2 to 3 times more likely to suffer from hypospadias than other babies. At the same time, the researchers also investigated nearly 100 adult men, and found that the sperm motility and quantity of people who used hair gel for a long time were significantly lower than those of others.
Studies have pointed out that this may be because the hair gel contains phthalate esters, which will destroy the level of androgen. Li Hongjun, chief physician of urology department of Peking Union Medical College Hospital, told the reporter that modern research has proved that substances with estrogen-like effects such as preservatives, plastic bags and beauty products will affect the development of male gonads, destroy the regulation of endocrine axis and lead to abnormal hormone levels. For boys, it may lead to gonadal hypoplasia syndrome, including hypospadias and cryptorchidism; For adult men, it may induce asthenospermia and testicular cancer.
Professor Paul, who is in charge of the survey, said that this result provides evidence for the damage of chemicals to fertility, but more in-depth research is needed to prove the connection between them. He believes that women should reduce the use of cosmetics and beauty products after pregnancy. At the same time, the study also proved that taking folic acid in early pregnancy can reduce the risk of hypospadias in boys by 36%. "For men, no matter in which period, we should try to reduce the use of beauty products such as hair gel.