Start with the supplement form
Powders, tablets, capsules and liquids can need different preparation. Describe the ingredient type, finished form and whether the sample contains live cultures or ingredients intended to inhibit microorganisms.
Choose the applicable tests
USP <2021> and <2022> provide supplement-specific microbiology pathways. The required enumeration and targeted organisms depend on the material and specification. Do not substitute a generic food panel for an established supplement specification without reviewing its scope.
Keep botanical and finished lots traceable
Record the ingredient identity, supplier or product code, lot and processing stage. Separate raw-material qualification from finished-product testing so each result answers its intended question.
Make comparisons useful
Use consistent units, preparation and methods for repeat checks. A change in product form or formulation may also change the suitability work needed.
Related testing & guidance
Technical & service references
Vanguard microbiology service menuFDA: Bacteriological Analytical ManualUSP: General Chapter <61>Source review: November 8, 2026. The agreed method and project scope govern the testing.