Fish oil labels: why 1000 mg is not 1000 mg of EPA and DHA

No. A softgel that says "1000 mg fish oil" usually holds far less than 1,000 mg of the omega-3s that studies measure, which are EPA and DHA. The rest of the capsule is other fats. To compare products, ignore the big number on the front and add up the EPA and DHA lines on the Supplement Facts panel.

This guide walks through the arithmetic, the intake figures health groups quote, and the label patterns that make comparison impossible.

Why is "1000 mg fish oil" not "1000 mg omega-3"?

Fish oil is a mix of fats. The National Center for Complementary and Integrative Health (NCCIH) explains that most omega-3 research has focused on two of them, EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid), and that fish oil supplements contain EPA and DHA. Only part of the oil is those two fatty acids, so the weight of the oil and the weight of EPA plus DHA are different numbers.

Labels often print both. A made-up example shows the gap:

This is an illustration, not a specific product. The point is that the 300 mg line is the number to use when you compare it with a study or a guideline. Two bottles that both say "1000 mg" on the front can differ several times over in EPA plus DHA.

How do you calculate EPA plus DHA per day?

The steps take under a minute:

1. Find the serving size. "Serving size: 2 softgels" means every amount on the panel is for two.
2. Find the EPA and DHA amounts for that serving. If only "Total omega-3s" is printed, note that it may include ALA or other fats and is not the same as EPA plus DHA.
3. Add EPA and DHA together.
4. Multiply by the number of servings you would take in a day.
5. Divide the bottle price by the number of servings to get a cost per serving, then by the EPA plus DHA per serving to compare bottles fairly.

Our guide to how we review supplement offers uses this same habit of comparing what the label states with what studies used.

How much EPA and DHA do health groups mention?

Several figures circulate, and they come from different sources for different purposes.

• The Harvard T.H. Chan School's Nutrition Source reports that the American Heart Association recommends 1,000 mg daily of EPA and DHA, preferably from fish, and that supplements can be considered in consultation with a physician. It adds that in specific cases, such as lowering triglycerides, the AHA recommends 2,000 to 4,000 mg daily under a doctor's supervision.
• The Linus Pauling Institute notes that the US FDA has ruled intakes up to 3 g a day of EPA and DHA "Generally Recognized As Safe" for inclusion in the diet, and that clinically meaningful triglyceride reductions have been demonstrated at 2 g a day of EPA plus DHA.
• The Dietary Guidelines for Americans 2020 to 2025, as summarized by NCCIH, recommend that adults eat 8 ounces or more of a variety of seafood per week, including some choices higher in EPA and DHA.

Notice how the numbers differ. A 300 mg softgel taken once a day is well under the 1,000 mg general figure, and the higher amounts in the studies usually mean several capsules a day. Whether that fits you is a question for your doctor, not a sales page.

How does food compare with a capsule?

The Nutrition Source table, drawn from USDA data, lists a 3-ounce serving of raw farmed Atlantic salmon at 733 mg EPA and 935 mg DHA, about 1,668 mg together. Wild Atlantic salmon at the same size is listed at 273 mg EPA and 952 mg DHA. Walnuts provide the plant omega-3, ALA, with no EPA or DHA.

NCCIH also says that for some health conditions the evidence for benefits from seafood is stronger than the evidence for omega-3 supplements, that other nutrients in seafood may play a role, and that people who eat seafood tend to have healthier lifestyles overall. Harvard makes a similar point: eating fatty fish weekly is strongly supported for heart protection, but many large clinical trials have not shown that omega-3 supplements provide the same protection.

What do the studies say about supplements?

The evidence is mixed, and it depends on who was studied. NCCIH reports that a 2020 review of 86 studies involving 162,796 people found that increasing EPA and DHA slightly reduced the risk of coronary events and coronary death. It also reports a 2020 review of 23 studies showing that EPA and DHA reduce triglycerides by about 15 percent but do not affect body fat or other lipids. For depression, NCCIH says that if there is an effect it may be too small to be meaningful.

In eye research, the AREDS2 trial gave people with macular degeneration risk 350 mg DHA plus 650 mg EPA a day, and in the main analysis it did not further reduce progression. We cover that trial in our AREDS2 guide. None of this means omega-3 is useless. It means a general "heart" or "brain" promise on a sales page needs the study, the dose and the population behind it.

Which label patterns make omega-3 products hard to compare?

These patterns show up in offers we audited. The reviews are the source for each point.

• Ingredient named, amount missing. The Bridport Health Super Strength Krill review notes that krill oil is a real, reasonably well-researched source of omega-3s, but the label gives no milligram amount for the krill oil, so there is nothing to compare with studies. The same review could not find a published study behind the page's headline fat-loss claim.
• DHA inside a blend. The Neuro Plus review records DHA as part of a 609 mg proprietary blend split across roughly 17 ingredients, while studies on DHA and cognition typically use 200 to 900 mg of DHA alone.
• Omega-3 as a side note. Some multi-ingredient formulas list omega-3 among many other items. Browse the heart health category and check whether an EPA and DHA line exists at all.

Different forms are also on sale. NCCIH lists fish oil, fish liver oil such as cod liver oil (which also contains vitamins A and D, harmful in excessive amounts), krill oil with omega-3s in the form of phospholipids, algal oil as a vegetarian source of DHA, and flaxseed oil, which contains ALA. Compare the EPA and DHA lines across these, not the words on the front.

What should you check on safety and cost?

NCCIH says side effects of omega-3 supplements are usually mild and include unpleasant taste, bad breath, headache and gastrointestinal symptoms such as heartburn, nausea and diarrhea. The Linus Pauling Institute says dividing a daily dose into smaller doses through the day decreases the risk of gastrointestinal side effects, and that intakes below 3 g a day are unlikely to result in clinically significant bleeding.

Harvard notes that omega-3 supplements can act as a mild blood thinner and may increase the risk of bleeding, and advises telling your doctor if you begin using them since they may interact with some medications, especially blood thinners. If you take prescription medicine, ask a pharmacist before adding a capsule.

On cost, remember that many offers are sold as subscriptions. Check the refund terms in our ClickBank refund guide and compute the price per 500 mg of EPA plus DHA, not per bottle. This is general information, not medical advice.

FAQ

How much EPA and DHA is in a 1000 mg fish oil capsule?

It varies by product, and only the label can tell you. Add the EPA and DHA lines for one serving. A capsule can hold a fraction of its weight as EPA plus DHA.

Is omega-3 the same as EPA and DHA?

No. NCCIH describes three types: EPA and DHA, found mainly in seafood and fish oil, and ALA, found in plant oils such as flaxseed, soybean and canola. Most research has focused on EPA and DHA.

Is krill oil better than fish oil?

NCCIH says krill oil contains omega-3s in the form of phospholipids, but the choice comes down to the EPA and DHA per serving and your doctor's advice. The label amounts matter more than the type.

Can you take too much fish oil?

The Linus Pauling Institute reports that the FDA considers up to 3 g a day of EPA and DHA generally recognized as safe, and that bleeding time is the main concern at very high intakes. Ask your doctor before going above the label serving.