The Claim
The degree of oxidation in fish oil supplements is associated with the discrepancy between labeled and actual content of EPA and DHA, indicating that degradation may contribute to under-labeling, although other factors also play a role.
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 that have degraded due to oxidation tend to have less EPA and DHA than what is listed on the label, which may explain why some products contain lower amounts than claimed, though other factors can also cause this discrepancy.
See the scientific wording
The degree of oxidation in fish oil supplements was associated with the amount of missing EPA and DHA (label claim minus actual content), suggesting that degradation may contribute to under-labeling, though other factors are also involved.
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
Many fish oil pills in New Zealand had much less EPA and DHA than they claimed on the label, and most were also spoiled or oxidized — meaning the fish oil went bad, which likely explains why the good stuff was missing.
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.