Identity comes before percentage
Define the Latin species, plant part, country of origin where relevant and extraction solvent. A 10:1 extract and a standardized extract are not automatically equivalent: one describes an input ratio, while the other should define one or more measured marker compounds.
For green tea, grape seed, turmeric, rosemary, milk thistle and ginkgo, state the marker family and test method—such as catechins or EGCG, OPCs, curcuminoids, carnosic acid, silymarin or flavone glycosides and terpene lactones.
Compare the full composition
Ask for assay, extraction ratio where used, native-extract content, carrier or excipient, moisture, particle size, bulk density and solubility or dispersibility. Confirm whether the method is HPLC, UV or another validated technique because results obtained by different methods may not be directly comparable.
Color, odor and flow can affect capsules, tablets, drink powders and cosmetic systems even when the marker assay meets specification.
Build a destination-ready document package
The purchasing specification should address botanical identity, marker assay, microbiological limits, heavy metals, pesticide residues, residual solvents, mycotoxins where relevant, allergens, irradiation or GMO statements and stability. Required limits depend on the grade, dosage form and destination market.
Use the supplier COA for lot release and confirm the current specification, SDS, regulatory status and finished-product testing before making claims or placing a commercial order.