EPA vs DHA basics
Understand the two marine omega-3s and compare their amounts without confusing oil weight with omega-3 content.
Read the topicThe omega-3 library
Understand the terms, formats and label details before comparing products. Begin with the basics and follow the evidence at your own pace.

A useful place to start / Topic
A practical walkthrough of serving size, EPA, DHA, other ingredients and quality claims.
Read the topicRead at your own pace
Educational information with sources and practical context—not a recommendation to buy or take a supplement.
Understand the two marine omega-3s and compare their amounts without confusing oil weight with omega-3 content.
Read the topicCompare fish oil and algae oil by EPA and DHA, serving size, dietary fit, quality information and the limits of the evidence.
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Understand oxidation, warning signs and the limits of a smell test or a laboratory report.
Read the topicA food-first overview of omega-3 sources, children's labels and questions for a pediatric clinician.
Read the topicLearn what is distinctive about krill oil, what to compare and where the evidence remains limited.
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Marine photographs illustrate organisms, not a particular supplement, ingredient or fishery. The macroalgae shown are not the microalgae in a particular supplement.