The Claim
A Peroxide Value (PV) to p-Anisidine Value (p-AV) ratio greater than 1 in fish oil supplements is uncommon and indicates recent oxidation during handling, as most fish oil products exhibit PV/p-AV ratios below 1, which suggests oxidation occurred prior to testing.
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.
Fish oil supplements with a Peroxide Value to p-Anisidine Value ratio above 1 are rare and suggest oxidation happened recently during handling; most supplements have ratios below 1, indicating oxidation occurred before testing.
See the scientific wording
In fish oil supplements, a Peroxide Value (PV) to p-Anisidine Value (p-AV) ratio greater than 1 is uncommon and may indicate recent sample oxidation during handling, as most products in this study and others had PV/p-AV ratios below 1, suggesting oxidation occurred prior to testing.
When fish oil oxidizes, it first forms peroxides, which then break down into other compounds like aldehydes. If oxidation happened long ago, most peroxides have already broken down, leaving more aldehydes than peroxides. If oxidation just happened, peroxides are still high and aldehydes are low, making the ratio of peroxides to aldehydes higher.
What the research says
1 studyThe study checked fish oil supplements and found that most had very low signs of recent spoilage, meaning if a bottle showed more recent damage than old damage, it was probably because it got exposed to air after being made — not because it was bad to begin with.
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.