Which ingredients in shampoos are very harmful to hair?

The safety of shampoo has been overlooked because as a rinse-off product, it stays in the hair for a very short period of time - basically, the shampoo stays in the hair for 1 to 2 minutes and then washes out. However, as a neglected safety issue, now that men are getting more and more worried about hair loss, it is necessary to explain some common potentially risky ingredients in shampoos in order to avoid them, which can have a role in protecting the scalp and hair loss for your reference.

1. SLS/SLES (Sulfates)

Shampoos containing these types of ingredients are the most common on the market. Usually, 消委會推介洗頭水sodium dodecyl polyether sulfate, XXXX ammonium sulfate and most shampoos will be shown in the ingredient list, see the top five of the ingredient list, as long as there is sulfate are such ingredients. These ingredients are much more irritating to the scalp than amino acids and alkyl glycosides, and due to the synthesis process, the ingredients are synthesized in a way that creates the carcinogenic risk of 1,4-dioxane. While small amounts of these ingredients have little effect on the human body, we have better options. Why not avoid these products?

2. DMDM Acetonylurea, Imidazole through Alkyl Urea

These types of ingredients act as preservatives by releasing formaldehyde. Formaldehyde is known to be a known carcinogen, formaldehyde and asthma, neurotoxicity and developmental toxicity. This class is also relatively easy to find in the ingredient list, shampoo ingredient list to see the word "urea" can be.

3. Polyethylene glycol, polypropylene glycol (PEG, PPG)

These ingredients are very common in the cosmetic industry. Ingredient lists usually begin with PEG, PPG, e.g. PEG-xxxx, PEG-xxxx, and are often used in shampoos as thickeners, emulsifiers and other ingredients in synthetic raw materials, and may contain ethylene oxide residues and 1,4-dioxane residues, both of which are carcinogens. So shampoos containing this ingredient should also try to be careful.

4. Methylisothiazolinone and Methylchloroisothiazolinone (Massachusetts Institute of Technology, CIT)

These 2 in the shampoo can be used as research a through a strong bactericidal preservative, scalp irritation is very large, and the development of important cells with the production of toxicity, the European Union countries have not been able to define it as a contact allergenic ingredients. Children with sensitive skin must pay more attention to this type of ingredients.

5. Hydroxyphenyl methyl ester / hydroxyphenyl ethyl ester / hydroxyphenyl propyl ester, etc..

Preservatives commonly used in cosmetics, potential endocrine disrupting chemicals that can be absorbed through the skin,鑊鏟blood and digestive system. This is also true of these types of ingredients, which can be avoided at all costs.

6. Phenoxyethanol

In recent years, preservatives are widely used, there are dangerous substances phenol, dioxane.

Phenol is a mutagenic and toxic substance. EU regulations clearly state that cosmetics should not contain phenol, which can be mixed with phenoxyethanol. Phenoxyethanol is produced by reacting phenol with ethylene oxide. The conversion rate of the synthetic reaction is less than 100%, so there will inevitably be residual phenol. 平安鐘電話Dioxane has been mentioned previously in the SLS. It is irritating to the skin, eyes and respiratory system and may cause damage to the liver, kidneys and nervous system. It is also a 2B carcinogen. If you use shampoos containing phenoxyethanol, it's a good idea to have test reports for both of these potential risks.

7. Synthetic fragrances or flavors

The ingredients of fragrances mainly consist of a very complex, potentially containing more than 3,000 learned chemicals in combination, including hormone disruptors and allergens.

For sensitive muscles and bodies, it is recommended to avoid shampoos and body washes with added chemical fragrances.

8. Silicone (Dimethicone, commonly known as silicone oil)

Silicone compounds make the surface of the skin smooth, but when they do, they form a plastic-like film. This alters the skin's ability to process toxins and can cause irritants to linger on the skin's surface, making pores more prone to clogging. Another point is that silicone ingredients are not biodegradable. There are hundreds of related derivatives, and laboratory animal studies have found that silicone oils can disrupt endocrine secretions, affect connective tissues, cause adverse immune responses, and damage the liver and lungs. So in the choice of shampoo, or to pay attention to avoid the use of silicone oil ingredients, especially men's short hair, there is absolutely no need to use silicone oil shampoo.

9. Acrylic acid (ester) copolymers

Acrylates, in shampoo and facial cleanser and other cleaning products can often also see, its main risk problem is that acrylates residue acrylamide belongs to a highly toxic chemical composition, inhalation of its vapor or percutaneous absorption, can cause poisoning of the students, produce impact on the neural network of the central nervous system dysfunction and liver damage, on the skin side of the corrosion of the skin is also different, on the eyes have irritating. So there are such main ingredients of shampoo and facial cleanser should be able to pay more attention.

Alcoholamine (Medea chamois)

DEA, MEA, and TEA have residual substances such as secondary alkanolamines and nitrosamines due to the synthesis process. Diethanolamine (DEA) is a representative type of sec-alkanolamine, European and Chinese regulations clearly stipulate that sec-alkanolamine should not be used in cosmetics, mainly because the reaction between amines and nitroso will produce nitrosamines, which are genotoxic mutagenic carcinogenicity is very high.

11. Benzyl Alcohol

Benzyl alcohol is commonly used as a preservative and is irritating to the skin. Inhalation of high concentrations of benzyl alcohol may cause central nervous system effects and may result in repeated or prolonged exposure to skin irritation.

12. Polyquaternary ammonium salts

Most quaternary ammonium salts contain acrylamide residues (produced during synthesis). Acrylamide monomer is neurotoxic, carcinogenic and teratogenic to humans, and can pass through the skin and gastrointestinal tract, causing various systemic reactions.

Although many of our shampoos carry the addition of polyquaternium as a conditioning agent, we have developed a recommendation that people with short hair avoid shampoo products with this type of ingredient.

相關文章：
How do you know if there are chemicals in your shampoo?
Can anyone wash their hair properly? Does what's in shampoo really cause cancer?
Don't mess around with anti-dandruff shampoos. Beware of these three ingredients!