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IFOS certification is a meaningful mark of fish oil purity and low oxidation.
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By Arun AgrahriLast reviewed
Short answer
IFOS is an independent program that tests fish oil for oxidation and purity, and it is a useful quality check. Rhonda Patrick advises choosing the triglyceride form and checking its oxidation status through IFOS, which she uses herself. She also notes that oxidized fish oil has not shown clear clinical harm.
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IFOS certification is a meaningful mark of fish oil purity and low oxidation.
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IFOS certification is a meaningful mark of fish oil purity and low oxidation, though low oxidation is a quality preference rather than a proven safety need.
IFOS stands for International Fish Oil Standards. It is a third-party program that tests fish oil batches for two things: oxidation, meaning rancidity, and purity, meaning contaminants like heavy metals.
Rhonda Patrick, on her own show, says the best testing resource she uses is the International Fish Oil Standards website, which lists brands along with oxidation, PCB and mercury results. Her buying advice is to choose the triglyceride form and check a product's oxidation status. She watches TOTOX too, a measure of total oxidation, and warns that most krill oil supplements are low-dose and often rancid.
EPA and DHA are polyunsaturated fats, which go rancid easily, so a badly made or badly stored bottle degrades. That is the case for third-party testing. Patrick adds a nuance most pages leave out.
The evidence does not show a measurable clinical harm from taking oxidized fish oil, and the heart benefits held up in large trials. Low oxidation is a reasonable quality preference, not a proven danger.
Others come at quality through contamination. Peter Attia wants pure, uncontaminated sources, balances fish intake against mercury, and notes that the supplement industry broadly lacks quality control. Mark Hyman recommends distilled fish oil and small low-mercury fish over big predators like tuna and swordfish: sardines, anchovies, mackerel, salmon and herring.
Andrew Huberman argues for high-quality fish oil and enough EPA.
The shared idea is third-party tested, low-oxidation oil in the triglyceride form, and IFOS is the certification that maps onto it.
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