OEM BUYER NOTE · 30 OCT 2026

How to Read a COA and Specification Sheet for Pet Supplements

Purchasing teams often ask for a COA and stop there. The certificate only means something when it is read against the specification it refers to, and when both are tied to the batch that will actually ship.

What is the difference between the two documents?

A specification sheet describes what the product is supposed to be: the parameters, the target range for each parameter and the test method used to check it. A Certificate of Analysis reports what one batch actually measured against those parameters. The specification is the rule; the COA is the result. Reading a COA without the specification is like reading a score without knowing the marking scheme.

What should a specification sheet contain?

At minimum, look for the formula or product reference, each parameter with its target range and unit, the test method, and the version or issue date. The reference matters most, because a specification that cannot be matched to the product you are buying tells you nothing about your order. Confirm that the reference on the specification is the same one used on the quotation and on the label artwork.

What should you check on the COA itself?

Check four things before you read any value. First, the batch or lot number, so the certificate belongs to the goods in front of you. Second, the production or manufacture date. Third, the product reference, which should match the specification. Fourth, the parameters reported, which should correspond to the specification rather than to a shorter marketing list. A certificate with no batch number cannot be tied to a shipment.

Which parameters usually appear?

The parameters depend on the dosage form and the formula, so ask the manufacturer to confirm the list for your project rather than assuming it. For liquid products, buyers commonly ask about appearance, pH and microbiological results; for powders, moisture and uniformity matter more. Ingredient specifications and microbiological test reports are separate documents from the COA, and the OEM / ODM page lists them among the files available to qualified partners.

How do documents connect to release decisions?

A batch should not be released on the strength of a certificate alone. Match the COA to the specification, confirm the parameters were tested by the stated method, and check that the result sits inside the target range rather than at its edge. Where a parameter is out of range, ask for the disposition in writing before the goods move. The inspection step on the LANDCE process page describes finished products and required documentation being checked before release.

What should a buyer request, in what order?

Start with the specification and confirm the product reference. Then request the COA for the specific batch. Then ask which documents accompany the shipment, and in what language. For a private label project, add the label artwork version so that the claims on the pack can be checked against the approved documentation. Projects at LANDCE start from 50 units, and documents are issued for qualified partners, so confirm the list during the quotation stage rather than after production.

For related reading, see the stability and shelf life guide, the packaging and label checklist, and the dosing and label dose table guide.

Need the document list for a specific formula? Request the specification pack or review our OEM and ODM services.