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the claim

Omega-3 dietary supplements in capsule form contain detectable levels of PCBs

the verdict
SUPPORTED
the evidence backs this
Recorded sources
4 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Multiple analytical surveys of omega-3 dietary supplements and fish oil capsules confirm the presence of detectable levels of polychlorinated biphenyls (PCBs), reflecting environmental bioaccumulation in marine sources.

The analysis

The retrieved papers provide robust chemical analysis of commercial omega-3 and fish oil supplements, consistently detecting PCBs and other persistent organic pollutants across multiple global markets.

Evidence for · 4
Dioxins and polychlorinated biphenyls (PCBs) in fish oil dietary supplements: Occurrence and human exposure in the UK
Recorded source metadata

Alwyn Fernandes, Martin Rose, S. White, D. Mortimer, M. Gem. Dioxins and polychlorinated biphenyls (PCBs) in fish oil dietary supplements: Occurrence and human exposure in the UK. 2006. https://doi.org/10.1080/02652030600660827

A survey of UK fish oil supplements found detectable levels of PCBs ranging from 1.1 to 41 ng kg-1 for dioxin-like PCBs.

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More for · 3
A nutritional-toxicological assessment of Antarctic krill oil versus fish oil dietary supplements.
Recorded source metadata

Bengtson Nash SM, Schlabach M, Nichols PD. A nutritional-toxicological assessment of Antarctic krill oil versus fish oil dietary supplements.. 2014. https://doi.org/10.3390/nu6093382

The study notes that extraction of fish oils can lead to persistent organic pollutant (POP) contamination, noting intermediate levels of POPs in krill and fish oils.

Estimation of Polychlorinated Biphenyls Intake through Fish Oil-Derived Dietary Supplements and Prescription Drugs in the Japanese Population
Recorded source metadata

Y. Matsuo, Kunihiko Nakai, I. Sakuma, K. Akutsu, Nozomi Tatsuta, Momoko Ishiyama, Taiki Higuchi, N. Ryuda, D. Ueno. Estimation of Polychlorinated Biphenyls Intake through Fish Oil-Derived Dietary Supplements and Prescription Drugs in the Japanese Population. 2019. https://doi.org/10.18502/jfqhc.6.4.1992

Testing of fish oil dietary supplements in Japan detected PCBs in the majority of sampled products.

Polychlorinated biphenyl concentrations and estimated intakes in fish oil supplements on the Japanese market.
Recorded source metadata

Tian-Qi Zhang, S. Takatsuki, Tamaki Sato, K. Tobiishi, T. Hori, Hiromi Nabeshi, T. Tsutsumi. Polychlorinated biphenyl concentrations and estimated intakes in fish oil supplements on the Japanese market.. 2024. https://doi.org/10.1016/j.jfp.2024.100235

Analysis of fish oil supplements on the Japanese market confirmed quantifiable concentrations of total PCBs across the products.

The paper trail · every fact has a biography
first checked02 Aug 2026
judged → SUPPORTED · 8602 Aug 2026
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