Start with the exact extract
An inquiry for epimedium extract should identify the species, plant part and extraction process, as well as the target marker specification. Ask the proposed source to document each item rather than relying on the product name alone.
Describe how the marker is measured
When requesting an icariin specification, include the analytical method, reporting basis and requested limits. If a document uses a different marker description, ask the supplier to explain what is measured before comparing quotations.
Request the complete composition
Ask about extraction solvents, carriers and other constituents. Include relevant residual-solvent, contaminant and microbiological requirements in the purchasing brief.
Keep the commercial brief connected
Send trial volume, expected repeat demand, application and destination together with the technical brief. Review the exact material and use for destination requirements before commercial supply.