Top provides ongoing support: lot traceability and re-test within shelf life using the retention sample, documentation re-issue (COA / SDS / origin / health / phytosanitary cert copies), formulation advice and a responsive complaint channel. For LTA buyers we assign a dedicated contact and periodic review of grade consistency.We treat the relationship as long-term — the after-sales step is where we protect your production continuity, not an afterthought.

Top authenticates by:HPLC for organic acids (citric/malic) and GC for the fruity volatile fingerprint matched to the natural Prunus mume Siebold & Zucc. (green plum / Chinese plum) profile and the GC/MS fingerprintGC/MS fingerprint plus targeted adulterant screeningSpecies + "Prunus mume Siebold & Zucc. (green plum / Chinese plum) species-specific raw material" declaration on COAHeavy metals + microbiology per food-safety.Every lot ships with COA plus assay. We screen adulterants, heavy metals and solvent residue.Lots failing the natural profile or exceeding limits are blocked.

Yes. Top supports third-party inspection and testing by SGS, Eurofins or an agreed lab at buyer cost. OptionsPre-shipment sampling plus lab verification (key markers, heavy metals, micro), and factory audit.We share the lot number and retention sample so the inspector draws representatively. Tell Top which parameters and which lab, and we will coordinate the appointment and incorporate the result into the shipment documents.