From the the goji berry fruit. Top's COA states "raw material: Lycium barbarum berry".The berry is water/alcohol extracted; no bark or resin is involved.

Top supports import compliance with: COA (Q/XXXX conformance) plus assay (key markers + heavy metals + microbiology + sensory) plus sensory sheet, CLP-format SDS (EU), certificate of origin, and references to the relevant frameworks — Q/XXXX enterprise standard; references GB 2762, GB 2760, GB 5009 series, GB 4789 series, and the NHC medicine-food dual-use list. For market-specific needs tell Top early.We document that this is a processed natural product (not a distilled essential oil where stated) — important for correct customs and formulation classification. Top adds the health / phytosanitary certificate for import on request.

Yes. Top keeps a retention sample for every lot and can re-test within the shelf life on request (key markers, heavy metals, micro, solvent residue).If a buyer disputes a result, we compare our retained-sample data with the original COA; a third-party lab (SGS, Eurofins) can be engaged for an independent read, with costs allocated by outcome. Re-testing protects both sides and is a standard part of our traceability commitment.

Top operates in-house QC with: HPLC / GC for the key markers, solvent-residue and heavy-metal checks, peroxide/acid value (freshness), plus microbiology and moisture/ash per the relevant standards. Out-of-spec lots are blocked.We can arrange third-party verification (SGS, Eurofins) at buyer cost and keep retention samples for re-testing within shelf life.

Authenticity is guaranteed byQ/XXXX conformance andPer-batch HPLC for polysaccharides and carotenoids, GC for the fruity volatile fingerprint plus GC/MS fingerprint plus targeted adulterant screening plus the COA species + "Lycium barbarum L.(goji berry) species-specific raw material" declaration. Top does not spike with cheaper substitutes or synthetic mimics.The HPLC for polysaccharides and carotenoids, GC for the fruity volatile fingerprint is the authenticity proof. Lots failing the profile or the limits are blocked.For high-assurance needs we offer third-party verification. Purity claims always tie back to the lot's own data — no unsupported matches-standard language.

Capacity is processing-slot plus raw-material-supply dependent: Top allocates runs across committed orders. Large volumes are feasible but need lead-time planning.We keep a small buffer of standard grades and recommend an LTA / annual framework for steady buyers so slots and sourcing are reserved ahead. Tell us your annual volume and we will size the allocation and confirm lead time.