Define the change before defining the tests
Use a change record that names the old material, proposed material, affected lots and implementation date. Ask whether the change concerns botanical source or part, extraction or purification, carrier, drying, specification or analytical method. The extraction review identifies several process variables affecting extraction efficiency.[2] That supports asking what changed; it does not prove that every process adjustment changes the commercial material in the same way.
Separate documentary and performance review
Ask for updated documents, but do not treat a new technical sheet as the entire requalification exercise. Prepare a product-specific comparison of identity, relevant composition, impurities, handling and intended-use performance. Agree which items need new evidence and which can be justified from existing records. An unchanged trade name or stock code should not be used as the sole reason to skip the assessment.
Review methods alongside the material
A method change can complicate interpretation of a material comparison. ICH Q2 includes comparison with an orthogonal procedure among accuracy evaluation approaches and emphasizes the intended analytical purpose.[1] Ask which results were generated by which revision and whether a planned bridging comparison is needed. Do not interpret a numerical shift automatically as a compositional change when the measurement procedure also changed.
Keep the actual application in the decision
For a beverage ingredient, ask whether the changed grade needs renewed trials in the intended matrix and process. For a powder, ask which handling or reconstitution checks matter to the receiving operation. These are recommended review questions, not universal validated protocols. A supplier’s unchanged marker specification should not replace evidence for a separately claimed formulation outcome.
Approval checklist before substitution
Record the change description; old and new document revisions; representative comparison material; justified checks; results; unresolved differences; approving roles; and treatment of existing stock. Ask how customers will be notified before affected supply and how retained samples can be traced. Keep commercial availability separate from technical approval: an immediately available replacement is not automatically an approved replacement.
Close the loop without overclaiming
State exactly what the comparison supports and retain conditions that remain open. If evidence is insufficient, document a hold, additional testing request or conditional decision through the responsible quality process rather than inventing a pass. This is an editorial change-review checklist, not a claim that ZL has completed a specific qualification, holds a certification or guarantees interchangeability between products.