Key takeaways
Qualification is a sequence, not a checklist. Each step exists to make the next one cheaper.
Start with documents, not samples
Ask for a recent batch COA and the specification sheet before discussing sample quantities. These two documents are free to produce and they tell you whether the supplier is describing stock material or a hopeful best case.
Check that the COA is a batch record with a lot number rather than a template, that the oxidation values have units and test methods attached, and that the values are consistent with the specification sheet. Inconsistency here is the single most reliable warning sign in the whole process.
Confirm the certificate reality
Certificates such as FSSC 22000, ISO, HACCP, GOED or IFOS are meaningful only if the scope covers the product and the site you are buying from. Ask which site the certificate covers, when it was issued, and whether it has survived the most recent audit cycle.
A supplier who can explain the scope of their certification is a different proposition from one who simply forwards a PDF.
Test one specification end to end
Pick the specification you actually intend to buy and run it through the full cycle: sample, COA review, packaging confirmation, and a quotation with Incoterms and lead time attached.
Do not compare suppliers across different specifications. A cheaper price for a different EPA/DHA ratio or a different molecular form is not a comparison, it is a distraction.
Then talk about volume and price
Volume, packing and Incoterms move the landed cost more than the quoted unit price does. A 190 kg drum against a smaller pack size changes freight, handling and the amount of oil you have open at once.
Related products and guides
The specifications below are the ones most often requested for supplier qualification, because they cover both the standard concentrate and the high-DHA end of the range.