For people using omega 3 supplements, how are you dealing with the internal oxidation issue?

By Nootopics July 3, 2026

Research and education, not medical advice.

Marine lipids contain a high proportion of polyunsaturated fatty acids, including the characteristic long chain n-3 (EPA, DHA). Upon peroxidation these lipids generate reactive products, such as malondialdehyde (MDA), 4-hydroxy-2-hexenal (HHE) and 4-hydroxy-2-nonenal (HNE), which can form covalent adducts with biomolecules and thus are regarded as genotoxic and cytotoxic. PUFA peroxidation can occur both before and after ingestion.

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These aldehydes have been described as potentially cytotoxic and mutagenic and they are all oxidation products originating from PUFA; HHE is formed from n-3 PUFA, HNE is formed from n-6 PUFA, while MDA is formed from both series.

— https://doi.org/10.1039/c5fo01401h

The findings showed that omega-3 fatty acids underwent a significant oxidation process, producing primary and secondary oxidation products. Furthermore, it appeared that stomach conditions had the biggest impact on PUFA oxidation during digestion, greatly reducing their bioaccessibility (Nieva-Echevarría et al. 2020).

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Additionally, stomach conditions seemed to exert the most significant effect on the oxidation of PUFAs during digestion, significantly decreasing their bioaccessibility. … It is concluded that digestion has a profound negative effect on omega-3 bioaccessibility

— https://doi.org/10.3390/molecules27020415

Many studies have shown that lipid oxidation also can occur during gastric and gastrointestinal (GI) digestion of lipid containing foods and supplements. As summarized by Halliwell et al, reasons contributing to this can be the presence of dietary pro-oxidants, e.g. iron ions, copper ions, lipid/hydrogen peroxides and heme-proteins, in combination with the low pH in the gastric phase and the action of digestive compounds.

— https://doi.org/10.1039/c5fo01401h

Archived into the Nootopics wiki from r/NooTopics — originally posted by u/Kalki_X on 2026-06-01. Curated, not authored by the community.