SIST EN ISO 29621:2017 PDF

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

• ISO 22716 (Cosmetic GMP) - referenced for manufacturing controls
• Cosmetic microbiology standards often considered alongside ISO 29621: ISO 18415, ISO 18416, ISO 22717, ISO 22718, ISO 21150

Keywords: EN ISO 29621:2017, ISO 29621:2017, cosmetics microbiology, microbiologically low‑risk products, microbial risk assessment, water activity, pH, cosmetic GMP.