Omega-3 basics: EPA, DHA, and ALA explained
The type of omega-3 on the label matters because plant and marine sources do not behave exactly the same way.
Only Health Editorial
April 29, 2026
Omega-3 is a family name, not a single ingredient. The three names most people see are ALA, EPA, and DHA.
ALA is found in plant foods such as flaxseed, chia, walnuts, soybean oil, and canola oil. The body can convert some ALA into EPA and DHA, but the conversion is limited.
EPA and DHA are found mainly in fish, seafood, fish oil, krill oil, and algal oil. DHA is especially concentrated in the brain and retina.
When comparing supplements, check whether the label lists total fish oil or the actual EPA and DHA amounts. A large fish oil number can still contain a smaller amount of active omega-3.
People who avoid fish may prefer algal oil as a plant-based source of DHA and sometimes EPA. People who eat seafood regularly may already be getting meaningful amounts from food.
Omega-3 supplements can interact with blood-thinning medications or affect bleeding risk at higher intakes, so ask a healthcare professional if that applies to you.
A good omega-3 decision starts with the label: source, EPA amount, DHA amount, serving size, and whether the format fits your diet.
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