Start with the material specification
Confirm the botanical source or material identity, manufacturing process and proposed grade. Relevant measures can include fibre content, moisture, particle size, bulk density and microbial limits. The required specification depends on the ingredient and intended use.
Check the certificate of analysis
A certificate of analysis should identify the material and batch. Check which results were measured, which limits apply and whether the analytical methods suit the fibre being declared. A certificate alone does not establish that the ingredient will work in your formula.
Test in the application
Compare samples at a defined inclusion level and under the same mixing and processing conditions. For a drink powder, record wetting, clumps, viscosity and sediment. For bakery, include water adjustment, dough handling and baked texture.
Agree the documents, test results and acceptance criteria needed before commercial supply. Confirm the current specification for the grade quoted, rather than relying only on general website information.