Do you provide a COA (certificate of analysis) for every batch?

Yes — a batch COA accompanies every shipment and is also issued for chargeable samples. The standard COA covers: product identity (botanical name, part used, process, origin), appearance/colour/odour, physicochemical measurements (relative density, refractive index, optical rotation with temperature, acid/ester values as applicable), GC-MS fingerprint summary (main components with area %), solubility in ethanol where relevant, microbiological status (TAMC/TYMC, pathogens on request), and packaging/batch traceability (batch no., production date, shelf life).

Because zhike peel oil has no national fixed ranges, the COA presents measured values against the enterprise-specification window plus the GC fingerprint, so buyers can compare lots objectively. COA templates can be aligned to your format (e.g. your QC checklist) after contract confirmation.

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