ISO 29621-2017 PDF

Full title and description

ISO 29621:2017 — Cosmetics — Microbiology — Guidelines for the risk assessment and identification of microbiologically low‑risk products. Guidance for cosmetic manufacturers and regulatory bodies to help define finished cosmetic products that, based on a risk assessment, present a low risk of microbial contamination and therefore may not require routine application of microbiological international standards and tests.

Abstract

ISO 29621:2017 provides a risk‑based framework and practical guidance for assessing formulations, processes, packaging and intended use to identify cosmetic products that are microbiologically low risk. It describes the factors that can create a hostile environment for microbial growth (for example water activity, pH, intrinsic formulation factors and preservative systems), and outlines considerations for manufacturing controls, packaging and intended use that support a low‑risk classification. The standard is advisory and does not replace specific microbiological test methods or limits; rather it helps determine when such testing or preservative challenge tests may be unnecessary.

General information

• Status: Published (confirmed at ISO review in 2022)
• Publication date: March 2017 (Edition 2, 2017)
• Publisher: International Organization for Standardization (ISO)
• ICS / categories: 07.100.40 (Cosmetics microbiology)
• Edition / version: Edition 2 (2017)
• Number of pages: 11 (ISO published length)

Scope

The standard applies to finished cosmetic products and provides guidance to manufacturers, formulators, quality and regulatory teams, and authorities to support a documented risk assessment that identifies products as microbiologically low risk. It addresses intrinsic product factors, formulation controls, preservative effectiveness, packaging and intended use that together reduce the likelihood of microbial contamination or growth, and explains when routine microbiological testing and preservative challenge testing may be omitted on a justified basis. ISO 29621 does not prescribe test methods or microbiological limits; it complements and references established microbiological standards and GMP guidance.

Key topics and requirements

• Framework for risk‑based identification of microbiologically low‑risk cosmetic products.
• Factors considered in the assessment: water activity (aw), pH, preservative system and concentration, presence of hostile ingredients (e.g., high salt, low water activity excipients), formulation and process controls.
• Role of packaging and container design in preventing ingress and contamination.
• Consideration of intended use, target consumer (e.g., children, mucosal contact), storage and shelf life.
• Guidance on when preservative challenge testing and routine microbiological monitoring may be unnecessary, and documentation needed to justify low‑risk classification.
• Emphasis that the standard is guidance only and does not replace specific microbiological testing standards or regulatory requirements; it should be used together with GMP and test standards.

Typical use and users

Used by cosmetic manufacturers (R&D, formulation, QA/QC), contract manufacturers, microbiology laboratories, regulatory affairs specialists and competent authorities. Practical applications include formulation screening to design inherently low‑risk products, preparing documented justifications for reduced testing, supporting quality management and regulatory submissions, and guiding decisions on sampling and preservative validation requirements.

Related standards

ISO 29621:2017 sits within the cosmetics microbiology suite and is commonly used alongside: ISO 17516 (Microbiological limits), ISO 11930 (Preservative efficacy / antimicrobial protection evaluation), ISO 21149 (Enumeration and detection of aerobic mesophilic bacteria), ISO 16212 (Enumeration of yeasts and moulds), ISO 18415 / ISO 18416 (detection of specified microorganisms / Candida albicans), ISO 22717 (Detection of Pseudomonas aeruginosa), ISO 22718 (Detection of Staphylococcus aureus), ISO 21150 (Detection of Escherichia coli), ISO 22716 (Good Manufacturing Practices for cosmetics) and ISO/TR 19838 (guidance on application of ISO standards in cosmetic microbiology).

Keywords

cosmetics, microbiology, low‑risk products, risk assessment, preservative systems, water activity, pH, GMP, preservative challenge test, microbial limits, ISO/TC 217

FAQ

Q: What is this standard?

A: ISO 29621:2017 is an advisory International Standard that provides guidelines for assessing and identifying cosmetic finished products that are microbiologically low risk and therefore may not require routine microbiological testing.

Q: What does it cover?

A: It covers a risk‑based approach considering formulation factors (water activity, pH, preservatives), packaging, manufacturing controls and intended use to determine whether a product can be classified as microbiologically low risk. It gives guidance on documentation and when testing may be unnecessary; it does not specify laboratory test methods or limits.

Q: Who typically uses it?

A: Cosmetic formulators, R&D, quality assurance and QC laboratories, contract manufacturers, regulatory affairs teams and regulatory authorities use it to support formulation design, QA decisions and regulatory justification for reduced testing.

Q: Is it current or superseded?

A: The 2017 edition (Edition 2) is the current ISO publication and was reviewed and confirmed by ISO at its 2022 review. It superseded ISO 29621:2010.

Q: Is it part of a series?

A: It is part of the cosmetics microbiology collection of ISO standards under ISO/TC 217 and is intended to be used together with standards such as ISO 17516, ISO 11930, ISO 21149, ISO 16212 and other microbiological method and GMP standards for cosmetics.

Q: What are the key keywords?

A: cosmetics, microbiology, low‑risk, risk assessment, preservatives, water activity, pH, GMP, microbial limits.