“1,000 mg fish oil” does not necessarily mean 1,000 mg of EPA and DHA. Look for the separate amounts in Supplement Facts.
ALA, EPA, and DHA are different omega-3s
ALA, EPA, and DHA are types of omega-3 fatty acids. ALA occurs in plant foods such as flaxseed and walnuts. EPA and DHA are found in fish and seafood; some supplements use algal oil. The body can convert ALA to EPA and DHA, but that conversion is limited.
Do not treat matching total milligram amounts of different omega-3 types as nutritionally interchangeable. A plant oil providing ALA and a product providing EPA and DHA answer different comparison questions.
The large front number can include other fats
The amount of fish oil describes the oil as a whole. EPA and DHA are components of that oil. Read their separate labeled amounts and note whether the panel lists other omega-3s.
As an illustrative example, a two-softgel serving might contain 2,000 mg of fish oil, 360 mg of EPA, and 240 mg of DHA. EPA plus DHA would be 600 mg per serving, or 300 mg per softgel. These are hypothetical numbers for understanding the label, not a real product or a recommended intake.
Compare like with like
Write down serving size, EPA, DHA, and the number of servings per container. Confirm whether a retailer is showing the same formula and bottle size. If a label does not disclose the detail you need, ask the manufacturer rather than filling the gap with an assumption.
Algal oils vary too: some provide mainly DHA and others provide both EPA and DHA. Dietary suitability, allergens, capsule ingredients, and exact contents deserve a separate check. “Fish free” should not be inferred from packaging color or a product photo.
Do not turn a label comparison into treatment
Prescription omega-3 medicines and retail fish oil supplements are not interchangeable. Do not replace a prescribed product with a supplement based on milligrams alone. Evidence for a specific prescription product, amount, or population should not be applied to every bottle on a shelf.
Tell your clinician about omega-3 supplements, especially if you take blood-thinning medicines, have a heart rhythm condition, or are considering high amounts. Individual benefits and risks require more context than a product comparison can provide.
Finish with cost and practicality
Cost per labeled serving is a useful starting point, but servings can contain very different amounts of EPA and DHA. Compare composition before using the price to choose. Include the capsule count per serving, delivered price, and whether the offer starts a subscription.
Store a product according to its label and check the expiration date. A large bottle that will not be used within its intended period may be less practical even when its sticker price per capsule is lower.
Sources & checks
Source pages checked October 4, 2026. General health information comes from the sources below. Product amounts and prices, where shown, come from manufacturer listings. See our methodology and correction policy.
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