For the microbiological examination of cosmetic products, there are several ISO standards that describe the corresponding methods. 

• ISO 21149 Counting of aerobic mesophilic bacteria
• ISO 16212 Counting of yeasts and molds
• ISO 18415 Detection of specified and non-specified microorganisms
• ISO 18416 Detection of Candida albicans
• ISO 21150 Detection of Escherichia coli
• ISO 22717 Detection of Pseudomonas aeruginosa
• ISO 22718 Detection of Staphylococcus aureus
  
  Further standards that include the microbiology of cosmetic products are 
• ISO 11930 Evaluation of antimicrobial protection
• ISO 19838 Guidance on the application of ISO standards in the field of microbiology
• ISO 17516 Microbiological limits