Yes, Nordic Naturals products are third-party tested. Every product the company makes is tested by certified independent laboratories for potency, purity, and freshness, and the results are published as Certificates of Analysis (COAs) that consumers can look up online. Beyond their own testing program, Nordic Naturals holds certifications from multiple independent organizations and has been evaluated by consumer advocacy labs.
What Third-Party Testing Covers
Nordic Naturals uses outside certified laboratories to verify three things about each product batch: that the omega-3 content matches what’s on the label, that contaminants like heavy metals fall below safety thresholds, and that the oil hasn’t gone rancid. The results are summarized on COAs, which are documents you can access on the company’s website by entering your product’s lot number. This level of transparency is not universal in the supplement industry, where companies are not legally required to publish testing data.
Independent consumer lab Labdoor has also tested Nordic Naturals products separately. Their analysis of Nordic Naturals Algae Omega, for example, scored 88.9 out of 100. That test found heavy metals (arsenic, lead, cadmium, and mercury) all below the limit of quantitation, meaning the amounts were too small to even measure. The peroxide value, a marker of freshness, came in at 2.6 meq/kg, well under the industry limit of 5.0 meq/kg.
One thing Labdoor’s testing did reveal: the EPA content in that particular product measured at 195 mg versus a claimed 255 mg, while DHA came in higher than labeled at 442 mg versus 390 mg. Minor variation between label claims and actual content is common in fish oil supplements, but it’s worth knowing that independent results don’t always match the label exactly.
Certifications From Independent Organizations
Beyond batch-level lab testing, Nordic Naturals holds several broader certifications from recognized third-party organizations:
- NSF GMP Registration. Their manufacturing facility in Vista, California is registered with NSF International under its Good Manufacturing Practices program (NSF 306, Section 6). This means the facility itself is audited for quality controls, equipment standards, and production consistency, not just the finished product.
- NSF Certified for Sport. Some Nordic Naturals products carry NSF’s Certified for Sport designation, which verifies the product is free of substances banned by major athletic organizations. This is one of the more rigorous supplement certifications available.
- Friend of the Sea. All Nordic Naturals omega-3 products carry this sustainability certification, which verifies that their fish come from stocks that are not overexploited, that fishing practices minimize bycatch of endangered species, and that manufacturing meets energy efficiency standards.
Freshness Standards and TOTOX Values
Fish oil freshness is a common concern, and it’s one area where Nordic Naturals’ testing data is worth understanding. The industry uses a measurement called the TOTOX value (Total Oxidation) to gauge how much an oil has degraded. The U.S. voluntary standard sets the maximum at 26 meq/kg. Nordic Naturals reports that their raw fish oils typically range between 5 and 14, with recent tests averaging around 7.0. That’s roughly a quarter of the allowed maximum.
This matters because oxidized fish oil can taste and smell off, may cause more digestive discomfort, and could potentially lose some of its health benefits. A lower TOTOX number means fresher oil, so the gap between Nordic Naturals’ reported values and the industry ceiling is significant.
How to Check Your Specific Product
If you want to verify the testing results for a bottle you’ve already purchased, look for the lot number printed on the packaging. You can enter this on Nordic Naturals’ website to pull up the COA for that specific production batch. The certificate will show the measured levels of omega-3s, contaminant testing results, and freshness markers. This is the most direct way to confirm what’s actually in the product you’re taking, rather than relying on general company claims.
For a fully independent check, sites like Labdoor purchase products off the shelf without the manufacturer’s knowledge and run their own testing. Cross-referencing both sources gives you the most complete picture of whether a product delivers what it promises.