The Claim
The concentration of EPA and DHA in fish oil supplements sold in New Zealand is not reliably predicted by price, best-before date, country of origin, or exclusivity, as these factors show no consistent association with oxidative stability or accurate labeling.
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, the amount of EPA and DHA in fish oil supplements cannot be reliably determined by price, expiration date, country of origin, or marketing claims, because these factors do not consistently correlate with how well the oil resists oxidation or whether the label accurately reports the omega-3 content.
See the scientific wording
The concentration of EPA and DHA in fish oil supplements is not reliably predicted by price, best-before date, country of origin, or exclusivity, as these factors showed no consistent association with oxidative stability or accurate labeling in New Zealand products.
The healthy oils in fish oil supplements break down over time due to exposure to air, light, and heat, turning rancid and losing their original amount, no matter how expensive or well-labeled the bottle is.
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 pills sold in New Zealand and found that expensive ones, ones with far-off expiration dates, or ones from other countries weren’t any better than cheap or local ones — many were stale and didn’t even have the amount of healthy oils they claimed.
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.