Is the hair dye powder bought in Thailand useful?

All kinds of hair dyes on the market contain a substance called p-phenylenediamine, which is mainly used to make pesticides and hair dyes. It is carcinogenic and has a strong affinity for keratin in hair, and its oxidation process is the fixation process when dyeing hair. It is not only the most effective component in hair dye, but also the most potentially harmful substance to human health. In addition, common heavy metals in hair dyes, such as mercury, lead and arsenic, will inevitably be absorbed by the skin, and long-term accumulation or excessive use will cause heavy metal poisoning. People who dye their hair repeatedly for a long time will increase the incidence of uterine cancer, lymphoma, breast cancer, skin cancer and leukemia. Long-term exposure to phenylenediamine may lead to chronic kidney injury, oliguria, anuria and increased creatinine. Common hair dyes contain heavy metal salts, which accumulate in the body for a long time, causing headaches, numbness of limbs, fatigue and other symptoms.

You may not know.

-What's the harm of dyeing your hair often?

The safety of dyeing hair is very important. Experts say that frequent hair dyeing may cause the following four hazards to the human body:

● May cause cancer.

P-phenylenediamine is a colorant that must be used in hair dyes, a common component that causes allergic reactions, and an internationally recognized carcinogen. Researchers at Yale University in the United States surveyed women who started dyeing their hair before 1980, and they found that people over 1/3 would develop lymphoma. Another survey conducted by the American Cancer Society on 6.5438+0.3 million women who dye their hair shows that their risk of leukemia is 3.8 times higher than that of women who don't dye their hair.

● Skin allergy

P-phenylenediamine can make the dyed hair color stronger, but it is also a strong allergen, which can cause skin allergy in people with sensitive constitution, among which contact dermatitis is the most common. In French, German and other EU countries, p-phenylenediamine has been banned from being added to hair dyes, but it is still used in China.

● Damage to liver and kidney

In order to enhance the dyeing effect, some products on the market will add heavy metals such as lead, mercury and arsenic, and the lead content of some products is even 5- 10 times that of paint. Long-term use will cause chronic damage to the body, not only may lead poisoning symptoms such as dizziness, numbness of limbs, abdominal pain, but also damage the functions of organs such as liver and kidney.

● Aggravate hair loss

Many patients lose their hair because of frequent hair dyeing. This is because benzene series compounds such as p-phenylenediamine in hair dyes can penetrate into the stratum corneum, an important part of hair, and undergo peroxidation, resulting in hair dryness, breakage and even hair loss.