Is the preservative-free hydrosol safe from microbial contamination?

Question

Accepted Answer

Yes — within its sealed shelf life. The product is safe by design: steam distillation sterilizes the water phase, filling is aseptic, the bottle is sealed and the mildly acidic pH discourages microbial growth. Safety LayerMeasureProcessHigh-temperature steam distillationFillingAseptic filling line, sealed closuresProductLow pH (4.2–6.2), single ingredientTestingTotal plate count, yeast & mold per batchStandardMeets cosmetic microbiological limitsEvery batch is released only after microbial testing (total viable count, yeast and mold) passes the limits in the Chinese Cosmetic Safety and Technical Specifications (2015) and comparable international requirements. Because no preservative is added, correct storage and short use-window after opening are part of the safety chain — keep sealed, cool and dark.We provide the batch microbial report and can run challenge testing for your finished formula if required.

Safety Layer	Measure
Process	High-temperature steam distillation
Filling	Aseptic filling line, sealed closures
Product	Low pH (4.2–6.2), single ingredient
Testing	Total plate count, yeast & mold per batch
Standard	Meets cosmetic microbiological limits

Is the preservative-free hydrosol safe from microbial contamination?

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