The Claim
In New Zealand, 83% of commercial fish oil supplements exceeded the recommended peroxide value threshold (PV >5 meq/kg), 50% exceeded the total oxidation value threshold (Totox >26 meq/kg), and only 8% met all international oxidation standards, indicating widespread oxidative degradation.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
In New Zealand, most fish oil supplements on the market have high levels of oxidative damage, with only a small fraction meeting international quality standards for freshness and purity.
See the scientific wording
In New Zealand, 83% of fish oil supplements exceeded recommended peroxide values (PV >5 meq/kg), 50% exceeded total oxidation values (Totox >26 meq/kg), and only 8% met all international oxidation standards, indicating widespread oxidative degradation in commercial products.
Fish oil contains fats that break down when exposed to air, light, or heat, creating harmful byproducts that make the oil rancid and unsafe.
What the research says
1 studyStudy: Fish oil supplements in New Zealand are highly oxidised and do not meet label content of n-3 PUFA
Scientists tested fish oil supplements in New Zealand and found that most were spoiled beyond safe levels, with only 1 in 12 meeting international freshness standards — just like the claim says.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.