A buyer's guide to what a Certificate of Analysis for Chinese herbal slices should include — batch number, botanical identity, test items, residues, and QA approval — and how to check it before approving a bulk order.
A step-by-step checklist for importers sourcing bulk Chinese herbs — how to verify origin, grade, sample approval, batch COA, testing, and traceability before you place an order, not just compare unit price.
How to choose Dong Quai (Angelica sinensis / Dang Gui) — judge oil content and aroma, read head, body and tail grades, spot sulfur treatment, and know what to check before ordering in bulk.
How to choose astragalus root slices (Huang Qi) — read the cross-section, spot sulfur treatment, understand grades and cuts, and know what to check before you buy in bulk.