IFOS — International Fish Oil Standards

Who runs it

The IFOS programme is run by Nutrasource, a Canadian contract research organisation specialising in nutraceutical testing. The IFOS lab is ISO/IEC 17025 accredited and uses methods aligned with the Global Organization for EPA and DHA Omega-3s (GOED) voluntary monograph — the de-facto industry standard for omega-3 quality.

What is actually tested

IFOS tests every certified batch against three categories of criteria. The results determine whether the batch passes, and at what star rating.

Potency

• EPA and DHA concentrations measured against label claim.
• Total omega-3 content checked. Concentrated products earn an additional rating point if EPA + DHA exceed 60% of total fatty acids.

Purity

• PCBs. Polychlorinated biphenyls — persistent industrial pollutants that accumulate in fish.
• Dioxins and furans. Trace contaminants from combustion and industrial processes.
• Heavy metals. Mercury, lead, arsenic, cadmium.
• Dioxin-like PCBs. Tested separately and assessed against WHO toxic equivalency limits.

Freshness (oxidation)

• Peroxide value (PV). Measures primary oxidation products. High PV indicates fish oil that has begun to go rancid.
• Anisidine value (AV). Measures secondary oxidation products that form as PV declines.
• Totox. A combined index (2 × PV + AV) used to judge overall freshness. The GOED limit is 26.

Oxidation matters because oxidised omega-3s lose their biological activity and can produce by-products with negative effects. Freshness is one of the criteria most often missed by other supplement certifications.

The five-star rating

IFOS results are published as a star rating from 1 to 5. Stars are awarded for meeting limits in each tested category, with bonus points for higher omega-3 concentration and lower contaminant levels. A 5-star result indicates a batch that not only passed, but exceeded the limits with margin.

The full per-batch report is public and downloadable. This level of disclosure is unusual among supplement certifications.

How to verify a batch

Search by brand or batch on the Nutrasource certifications portal at certifications.nutrasource.ca. Each listed batch links to the full test report in PDF, showing the actual measured values for each parameter. Match the lot number on the bottle to the report.

What IFOS does not cover

• Banned-substance screening. IFOS is not a sport-doping programme. For athletes, choose a fish oil that also carries Informed Sport or NSF Certified for Sport certification.
• Sustainability or sourcing. IFOS does not assess fishery sustainability. Programmes such as the Marine Stewardship Council (MSC) cover that separately.
• Health-outcome claims. The certification confirms what is in the bottle, not that the product will achieve a particular cardiovascular or anti-inflammatory effect.

When it matters most

IFOS matters more than most supplement certifications because fish oil is one of the categories with the highest documented rates of mislabelling and contamination. Independent testing has repeatedly found products on the shelf where actual EPA+DHA content falls short of label claims, oxidation markers exceed recommended limits, or both.

For any omega-3 product — fish oil, krill oil, algae-derived omega-3 — IFOS is the clearest available signal of quality. Algae-derived oils are often tested under the related IVO (International Vegetable Oils) programme run by the same lab.

Common misconceptions

• Star ratings change between batches. A brand with a 5-star history can produce a 4-star batch. Always check the specific lot, not the brand-level marketing.
• An IFOS test on a website is not always current. Some brands display old IFOS reports as evidence of quality. Check the date on the report and confirm the lot in your hand has its own test result.