Overview
EN ISO 29621:2017 (ISO 29621:2017) - "Cosmetics - Microbiology - Guidelines for the risk assessment and identification of microbiologically low‑risk products" - provides guidance to cosmetic manufacturers and regulatory bodies on how to perform a microbiological risk assessment to identify finished cosmetic products that, based on their characteristics, present a low risk of microbial contamination and therefore may not require routine application of microbiological International Standards or extensive microbial testing.
This standard replaces the 2011 edition and is a guidance document (no normative references). It clarifies when product features create a hostile environment for microorganisms and how those features should be evaluated in a risk‑based quality strategy.
Key topics and technical focus
- Definition of microbiologically low‑risk products: products whose physical and chemical environment denies microorganisms the requirements for growth and/or survival.
- Risk assessment framework: overall process including risk identification, analysis and evaluation to decide if microbiological standards apply.
- Product composition factors:
- Water activity (aw) - role of available water in supporting microbial metabolism and growth.
- pH of formulation - influence on survival and proliferation.
- Raw materials - ingredients that create hostile conditions (e.g., osmotic or chemical inhibitors).
- Note: presence of preservatives alone does not automatically classify a product as low‑risk.
- Production and packaging considerations: manufacturing conditions (GMP), packaging that prevents ingress of microorganisms, and how combined factors increase hostility to microbes.
- Combined factors: how multiple sub‑lethal or lethal factors act together to inhibit growth or cause cell death.
Practical applications and users
Who uses EN ISO 29621:2017:
- Cosmetic manufacturers (R&D, QC, microbiology labs)
- Regulatory authorities and notified bodies
- Quality assurance managers and auditors
- Contract manufacturers and formulators
How it’s used:
- To determine whether a finished product requires routine microbiological testing or can be justified as low‑risk.
- To inform product development decisions (formulation and ingredient selection) with microbiological safety in mind.
- To define sampling and testing strategies within a risk‑based quality management system.
- To support regulatory submissions and internal documentation demonstrating a reasoned microbiological risk assessment.
Related standards
Keywords: EN ISO 29621:2017, ISO 29621:2017, cosmetics microbiology, microbiologically low‑risk products, microbial risk assessment, water activity, pH, cosmetic GMP.