What is the most commonly used preservative for cosmetics?

1, hydroquinone: medically called hydroquinone, skin bleach. Michael Jackson used products containing this ingredient to bleach his skin. A survey by the US Food and Drug Administration shows that many night creams contain this ingredient. 2, lead, mercury: it also has the effect of whitening and freckle, and is also added to lipstick, lip gloss, nail polish, etc. , play the role of precipitation and coloring. Long-term use will thicken the stratum corneum and directly enter the digestive organs and internal organs. Although the skin looks white for a while, it will precipitate melanin under the skin for a long time, forming lead-mercury spots or lead-mercury poisoning, which is difficult to remove. 3, methanol: often used as an added ingredient of spices into skin care products, toxic. 4, chromium, neodymium: chromium can cause allergic dermatitis or eczema, the course of disease is long, long and not healed. Neodymium is very irritating to eyes and mucous membranes, and moderately irritating to skin. Inhalation can also lead to pulmonary embolism and liver injury. According to China's Hygienic Standard for Cosmetics (GB79 16), cosmetics must not contain prohibited substances such as chromium and neodymium. Some time ago, chromium and neodymium were found in some products of SK ⅱ, Estee Lauder, Lancome, Dior and Clinique. 5. Soap alkali component: It plays a role in removing oil stains and is often added to facial cleanser. However, it will destroy the natural weak acid protective film of the skin (indoor fumigation with vinegar means sterilization in an acidic environment), making it easier for bacteria and mites to grow and reproduce. Commonly used alkaline facial cleanser will accelerate skin aging. 6. Alcohol: It can astringe pores, diminish inflammation and sterilize, but it is easy to make skin dry and wrinkle, accelerate protein degeneration of skin and promote aging. 7. Mineral oil (paraffin oil), vaseline and lanolin. : Cover fine wrinkles and lock in moisture. However, it will block pores and make the skin unable to breathe, resulting in dull skin and large pores. At the same time, the excrement in the pores is not easy to be discharged, leading to acne, acne and folliculitis. At the same time, these ingredients have strong ability to absorb ultraviolet rays and are easy to cause skin spots. Scientific research has found that mineral oil can cause cancer. 8. Artificial saccharin. It is extracted from coal tar and is a flavoring agent in cosmetics, which is reported to be easy to cause cancer. 9. Pigments, preservatives and spices: most of them are synthetic products, such as coal tar synthetic spices and aldehyde synthetic spices. There are nitroso dyes and nitro dyes in coal tar pigments, which are very harmful to human body, and once they enter human body, they are even more harmful. The main component of preservatives put into cosmetics is formaldehyde, which will pollute indoor air when released. Hair dye is an oxidation dye, which contains more than 20 chemical components, about half of which can induce cancer. 10, hormones: when used in cosmetics, hormones can temporarily eliminate wrinkles, make the face full, moist, elastic and shiny, inhibit and relieve the skin, and make the skin not repel, relieve itching and relieve pain after being hurt, so they are widely used as "special effects". However, hormone is a chemical component that is easily oxidized. People who often use hormone products will get darker and darker in the sun in summer, and it is difficult to take them off at last. This is because cosmetics are oxidized in the sun, blocked by pigment cells, darker and darker, and deposited on the epidermis. Often mistaken for "chloasma". Frequent use of products such as hormone cosmetics or skin cream can irritate the skin for a long time, which will easily make the skin immune function hyperactive, lead to the decline of the skin's autoimmune function, and form sensitive skin and allergic skin. 1 1, phosphoric acid. A harmful compound to prevent the loss of fragrance is ubiquitous in perfume.