Ensuring Omega-3 Purity and Potency of Marine Oils
In-process sampling, purity checks, and what the GOED monograph actually requires of a supplier.
Marine oil moves through several processing steps between the catch and the capsule, and each one can change both potency and oxidation status. Testing only the final product tells you what you ended up with, not where it went wrong.
The monograph sets two kinds of limit
The GOED monograph specifies both composition — what has to be present — and oxidation — what must not exceed a threshold. A supplier can pass one and fail the other, which is why a certificate reporting only EPA and DHA content is incomplete.
A high EPA number and a high anisidine value describe the same oil. Only one of them usually appears on the certificate.
Sampling in process
Pull samples at deodorisation, after concentration and at fill. Three points cost little more than one and turn an argument about a failed batch into a short conversation about which step moved.
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