Because of the structure of cosmetic products, microorganisms can easily grow in them. This may be the case for opened and used cosmetic products as well as for products that have not yet been opened. Because in cosmetic products, carbohydrates, sugar alcohols, proteins, minerals, fatty acids, amino acids, vitamins and water, and this environment is very suitable for the development of microorganisms.

One of the most common microorganisms in cosmetic products is Staphylococcus Aureus. This microorganism, like its counterparts, poses a health risk to users. While some microorganisms present in cosmetic products cause only degradation of products, Staphylococcus Aureus causes great economic losses for manufacturers and serious discomfort for users. In order to produce healthy cosmetic products, hygiene conditions must be complied with.

Creams, lotions, powders and shampoos are the most sensitive products for the growth of microorganisms. Among them, the water content is very high and is very suitable for the growth of bacteria if proper protection is not provided. Powdered products such as eye shadows and powders also produce microorganisms depending on environmental conditions.

The microbiological quality of cosmetic products is determined by counting bacteria, mold and yeast. Various countries have developed different standards in this regard. For example, in the United States, the Cosmetic Manufacturers Association (CTFA) has established microbiological quality limits for cosmetic products and manufacturers must comply with these requirements. In addition, Staphylococcus Aureus bacteria should not be present in cosmetic products as well as other dangerous bacteria.

Microbiological inspections of cosmetic products are carried out strictly in every country. Products that do not meet these criteria are collected from markets. Many products have been recalled in European Union countries due to microorganisms detected in unused cosmetic products.

Accredited laboratories also carry out the search for Staphylococcus Aureus bacteria within the scope of microbiological analysis studies. One of the standards based on these studies is TS EN ISO 22718 Cosmetics - Microbiology - Staphylococcus Aureus search standard.