Quality & Testing
Not every Omega-3 supplement delivers what it promises. The TOTOX value, heavy metal contamination and independent certifications determine actual product quality.
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Overview
Omega-3 Quality Criteria
What to look for when choosing an Omega-3 supplement — 7 key criteria.
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Freshness
TOTOX Value Explained
What the TOTOX value tells you and why oxidation is the biggest risk with fish oil.
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Purity
Heavy Metals in Fish Oil
Mercury, lead, arsenic — what is the real risk and how do you protect yourself?
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Purity
PCBs and Dioxins
Persistent organic pollutants in Omega-3 products — EU limits and testing.
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Concentration
Purity Grade and Concentration
EPA+DHA concentration in the oil: how much active ingredient is really inside?
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Certification
IFOS, MSC, Friend of the Sea
Which certifications exist and what do they really say about product quality?
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Test Results
Is There an Omega-3 Test Winner?
What Which? (2026) and Stiftung Warentest (2020) actually tested.
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