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Natural Health Product microbiology testing should begin with the product, specification and quality decision, not simply with the name of a United States Pharmacopeia chapter.
Depending on the product and microbiological requirement, applicable testing may involve:
These chapters do not all answer the same question.
Some methods evaluate how much microbial growth is present, while others evaluate whether specified microorganisms are detected under the applicable method.
PBR Laboratories supports Natural Health Product manufacturers, ingredient suppliers, contract manufacturers, brand owners and quality teams from Edmonton across Alberta, Western Canada and Canada.
The starting question should be:
What microbiological requirement applies to this product, what sample is being tested, and what decision must the result support?
The appropriate USP microbiology test depends on the Natural Health Product category, matrix, specification and microbiological question.
Microbial enumeration testing measures microbial populations.
Specified-microorganism testing evaluates selected microorganisms according to the applicable method.
USP <61>/<62> and USP <2021>/<2022> should therefore not be treated as interchangeable test names.
The specification should first establish whether the product requires:
Microbial enumeration measures the microbial population recovered from the submitted sample under the applicable analytical method.
Depending on the product and specification, this may include measures such as:
Enumeration testing can support:
The reported value should always be interpreted against the applicable method, units and product specification.
USP <61> addresses microbial enumeration for applicable non-sterile products.
The test helps answer:
How much microbial growth was measured in the submitted sample?
An enumeration result does not identify the source of an elevated count and does not automatically determine whether a batch should be released.
Those decisions require the product specification, sampling context and quality-system requirements.
USP <62> addresses testing for specified microorganisms in applicable non-sterile products.
This answers a different question:
Does the submitted sample meet the applicable requirement for the specified microorganism?
The microorganisms included in the testing program should reflect the product and specification rather than a generic panel applied to every Natural Health Product.
USP <2021> addresses microbial enumeration for applicable nutritional and dietary supplement products.
Testing may support assessment of aerobic microbial populations and yeast and mould where these parameters are relevant to the product specification.
The result should be considered alongside:
USP <2022> addresses specified-microorganism testing for applicable nutritional and dietary supplement products.
Depending on the product and specification, relevant microorganisms may include:
The applicable testing should be confirmed for the specific Natural Health Product.
| Testing Question | Applicable Framework |
|---|---|
| Microbial enumeration for applicable non-sterile products | USP <61> |
| Specified microorganisms for applicable non-sterile products | USP <62> |
| Microbial enumeration for applicable nutritional and supplement products | USP <2021> |
| Specified microorganisms for applicable nutritional and supplement products | USP <2022> |
The method should be selected because it matches the product category, specification and analytical question, not simply because the chapter is familiar.
Potentially.
A finished-product specification may contain:
The appropriate program depends on:
There is no single microbiology panel that should automatically be used for every Natural Health Product.
Raw-material microbiology and finished-product microbiology answer different questions.
Raw-material testing may support:
Finished-product testing evaluates the actual manufactured product after:
Passing raw materials does not automatically establish that the finished product will meet its microbiological specification.
Related Resource: Raw Material vs Finished Product Microbiology Testing
A high microbial count means that the submitted sample produced a result above the applicable comparison criterion or specification.
It does not automatically identify the cause.
An investigation may need to consider:
Related Resource: High Microbial Count in Natural Health Products
A negative or not-detected result applies to the submitted sample under the applicable method.
It does not automatically prove that the entire production lot is free of the microorganism.
How confidently the result represents a larger lot depends on:
Laboratory results are only as representative as the submitted sample allows.
Potential issues include:
Before submitting a large or heterogeneous lot, discuss sample requirements with PBR.
Moisture and water activity can provide useful supporting information during some microbiological investigations.
They do not replace microbiology testing.
Moisture describes the amount of water associated with the product.
Water activity provides information about how available that water is within the formulation.
Related Service: Supplement Moisture & Water Activity Testing
The product and specification should determine the method.
They answer different microbiological questions.
Ingredient and matrix risks can vary substantially.
Manufacturing introduces additional factors.
The result applies to the submitted sample.
First determine what the follow-up testing needs to establish.
PBR Laboratories provides Natural Health Product microbiology support from Edmonton, Alberta.
Manufacturers and quality teams can discuss:
PBR supports Natural Health Product manufacturers and quality teams throughout Western Canada.
The testing pathway should be:
product → specification → microbiological question → applicable method → representative sample → result → quality decision
PBR supports Canadian Natural Health Product manufacturers, brand owners, ingredient suppliers and quality teams requiring applicable microbiology testing.
PBR helps clients understand not only the result, but also what the result represents and what testing decision may be appropriate next.
Depending on the product and specification, applicable methods may include USP <61>, <62>, <2021> and <2022>.
Enumeration measures microbial populations. Specified-microorganism testing evaluates selected microbial targets.
No. The appropriate testing depends on the product, ingredients, specification and quality program.
PBR supports Salmonella testing for applicable matrices.
PBR supports Escherichia coli testing for applicable matrices.
No. The result applies to the submitted sample, and the sampling plan affects how confidently it represents the production lot.
Potentially. Raw-material testing can support supplier qualification, incoming-lot decisions and investigations.
No. Finished-product microbiology is also influenced by manufacturing, handling, packaging and storage.
Tell PBR: