Microbial contamination of cosmetics is in addition to raw materials other than natural ingredients, to affect its safety is another major factor. Generally be cosmetic contamination in the production process as level 1 pollution; cosmetics in the course by the pollution called the secondary contamination.

Level 1 pollution: from microorganisms in the cosmetic raw material itself, can also be contaminated during production. Therefore, their physical and chemical properties of raw materials, moisture content, the production environment and equipment, health conditions,
tretinoin production workers, health etc, the quality of health products for cosmetics.

Cosmetic raw materials used in the production process,
biotin the container and the production process can be affected by microbial contamination, especially in filling the cooling process more vulnerable to pollution. Cosmetic raw materials have a variety of possible contamination by microorganisms, especially in the natural plant and animal ingredients, mineral powder, pigments, ion exchange water and other raw materials susceptible to microbial contamination. Some formulations of cosmetics rich in water and nutrients, such as Cream cosmetics mostly "nutrition", which by the addition of various amino acids, protein, or supplements (placenta extract, ginseng, licorice extract, etc.) components of the benefit microbial growth and reproduction. In recent years, biological products of active substances in cosmetics increasingly widespread application, many functional cosmetics such as high-moisture, anti-aging, whitening, freckle etc by adding biologically active substances or extracts of natural plants and animals to achieve the effect. And such material and are conducive to microbial growth nutrients, controlling microbial contamination of cosmetics is to ensure quality and safety of cosmetics, one of the keys.

Level 2 pollution: cosmetics unsealed, use or contamination occurred during storage, including the hand after the micro-organisms into contact with cosmetics, the microbes into the air has been contaminated. Some of the beauty salon cosmetics are shared,
Cosmetics material but can cause cross-infection. Although the cosmetic preservatives inhibit the propagation of microorganisms, but its role is limited. Therefore, to prevent secondary contamination of cosmetics cosmetics for prevention of adverse reactions also have an important significance. Source:http://www.cosprm.com