Abstract: Cosmetics Microbiologist with chemistry knowledge ensures personal care products are safe, effective, and free from harmful microbial contamination. They combine biological testing with chemical formulation knowledge to test raw materials and finished products, preventing spoilage and ensuring regulatory compliance. The following comprehensive job description outlines the responsibilities, required qualifications, and daily functions for this hybrid role.

Core Responsibilities:

Microbiological Testing & Safety: Conduct routine microbiological analysis (e.g., bioburden, sterility, and preservative efficacy tests) on raw materials, in-process samples, and finished formulas. Design and perform Preservative Efficacy Tests (PET) to validate that product formulations can withstand consumer use. Evaluate and classify the microbial load of products during stability and shelf-life studies.
Chemistry & Formulation Support: Collaborate directly with formulation chemists to ensure new cosmetic products are chemically and microbiologically stable. Analyze chemical interactions to understand how different preservatives (e.g., C₈H₁₈O₃, parables, organic acids) behave in various formulations. Conduct standard chemical quality parameters like pH and viscosity testing, which often directly impact microbial growth environments.
Quality Control (QC) & Compliance: Investigate Out-of-Specification (OOS) or Out-of-Trend (OOT) microbiological results to identify root causes and implement corrective actions. Maintain a sterile and compliant laboratory environment following Good Laboratory Practice (GLP) and industry standards (e.g., ISO 22716, FDA cosmetic guidelines).