Top authenticates by:GC-MS for the coumarin/herbaceous volatile fingerprint matched to the natural Lysimachia foenum-graecum Hance (Chinese sweet grass) profile and the GC/MS fingerprintGC/MS fingerprint plus targeted adulterant screeningSpecies + "Lysimachia foenum-graecum Hance (Chinese sweet grass) 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.

Top sources raw material through contracted supply bases with a traceability ledger (raw-material source through processing to the finished product). Buyers can request a supply-chain / origin declaration and (for dedicated lots) organic certification.We aim for transparent, documentable sourcing rather than vague natural claims.

Top ships worldwide by sea or air under the agreed Incoterm. For sea we use FCL / LCL from Shanghai / Qingdao; for air, DHL / FedEx / airline cargo. lycium-barbarum-concrete is low-hazard, but we still ship it with an SDS where applicable and use qualified forwarders.We provide tracking and can handle door-to-door or port-to-port. Freight is quoted separately from the product FOB price; tell Top your destination port / airport and preferred mode for a quote.

Shelf Life12-24 months from production (sealed, cool, dark). Strict ProtectionSealed, away from light/heat/moisture; cool (<25C) and dry storage; refrigerate for long-term.Top formulates within regulatory limits and packs under clean, low-moisture conditions It may thicken at low temperature — normal; re-liquefies on warming. Re-test before the end of shelf life.The COA notes the production date and recommended storage.

Availability is governed by processing capacity and raw-material scheduling rather than a single harvest window. Top keeps buffer stock of standard grades and contracts raw material volume; for large or steady volumes we recommend an LTA to reserve processing slots and stabilize price.We communicate raw-material market conditions on each quotation.