How Much Omega-3 Per Day? EPA and DHA Doses by Goal, From the Trials
There is no US target for EPA and DHA. Trial doses run from up to 1 g of EPA a day for mood to 4 g of prescription omega-3 for very high triglycerides, and higher doses come with a dose-linked rise in atrial fibrillation.
By Kymata Health Editorial Published Last checked
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Label: 2 softgels: 800 mg EPA and 800 mg DHA.
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Key takeaways
From 8 sources- The US Adequate Intake for omega-3 applies only to ALA, at 1.6 g a day for men and 1.1 g for women; no intake recommendation was set for EPA or DHA1.
- A typical 1,000 mg fish oil capsule holds about 180 mg of EPA and 120 mg of DHA, so the EPA plus DHA line on the label matters more than the capsule size1.
- At 1 g a day, omega-3 did not significantly reduce major cardiovascular events in the VITAL trial of 25,871 adults8.
- For very high triglycerides, 4 g a day of prescription omega-3 lowered triglycerides by 30% or more, according to an American Heart Association advisory2.
- Across 7 large outcome trials, atrial fibrillation risk rose about 11% for each extra gram a day of omega-35.
What this article covers
2 evidence profilesThe evidence, graded
Pulled from the trial tables in our evidence profiles. Grades follow our evidence-grading policy.
Graded findings
3 rows- ∅No effectHeart and blood-vessel events, pooled trials (all doses)No effect Little or no effect on cardiovascular events (RR 0.96), all-cause mortality (RR 0.97) or stroke (high/moderate certainty). Possible slight reduction in coronary heart disease events and mortality (low/moderate certainty). Triglycerides fell by about 15%, dose-dependently (high certainty).Omega-3 (fish oil, krill oil, algal oil) · Meta-analysis · n=140,482 · 2020 · PMID 32114706
- ∅No effectHeart and blood-vessel events at 1 g/day (VITAL)No effect Major cardiovascular events HR 0.92 (95% CI 0.80–1.06) and invasive cancer HR 1.03; neither significant. Secondary: total myocardial infarction HR 0.72 (0.59–0.90). No excess bleeding.Omega-3 (fish oil, krill oil, algal oil) · RCT · n=25,871 · 2019 · PMID 30415637
- AGrade AIrregular heart rhythm riskWorsened Omega-3 was associated with more atrial fibrillation (HR 1.25). Risk was higher in trials using >1 g/day (HR 1.49) than ≤1 g/day (HR 1.12); each extra 1 g/day raised the HR by about 11%.Omega-3 (fish oil, krill oil, algal oil) · Meta-analysis · n=81,210 · 2021 · PMID 34612056
There is no official EPA and DHA target in the US
The US Adequate Intakes for omega-3 are 1.6 g a day for adult men and 1.1 g for adult women, but from age 1 they apply only to ALA, the plant omega-31. The Institute of Medicine did not set intake recommendations for EPA or DHA1.
ALA from foods such as flaxseed is converted to EPA and then DHA, but the conversion is very limited, at reported rates below 15%1. That is why EPA and DHA doses are counted separately.
Other bodies do set numbers. The European Food Safety Authority uses 250 mg a day of EPA plus DHA for all adults1. The American Heart Association advises 1 to 2 servings of seafood a week, and does not recommend omega-3 supplements for people who are not at high cardiovascular risk1.
Read the EPA and DHA line, not the capsule size
A typical fish oil supplement provides about 1,000 mg of fish oil containing 180 mg of EPA and 120 mg of DHA, though amounts vary widely1. By that arithmetic, 1 g of EPA plus DHA takes a little over 3 such capsules1.
The form matters less than the amount. Omega-3s as triglycerides, re-esterified triglycerides and free fatty acids are somewhat better absorbed than ethyl esters, but all forms significantly raise blood EPA and DHA1. For source differences, see fish oil vs krill oil vs algal oil.
Heart health: little effect at common doses
In VITAL, 25,871 US men aged 50 and over and women aged 55 and over took 1 g a day of marine omega-3 or placebo for a median of 5.3 years8. Major cardiovascular events did not differ significantly (hazard ratio 0.92, 95% CI 0.80 to 1.06), and there was no excess bleeding8.
A Cochrane review of 86 trials with 162,796 people, at doses from 0.5 g to more than 5 g a day, found little or no effect on deaths from any cause or on cardiovascular events7. It found a possible slight reduction in coronary heart disease events, rated low certainty, and did not find a clear difference by dose7.
For people who already have coronary heart disease, the American Heart Association suggests about 1 g a day of EPA plus DHA, preferably from oily fish, with supplements considered under a physician's direction1.
Triglycerides: the clearest dose effect
Triglycerides are where omega-3 dose shows most clearly. In the Cochrane review, long-chain omega-3 lowered triglycerides by about 15% in a dose-dependent way, rated high certainty7.
At 4 g a day, prescription omega-3 lowered very high triglycerides (500 mg/dL or above) by 30% or more, the American Heart Association advisory concluded2. Products with both EPA and DHA raised LDL cholesterol in that group, while EPA-only products did not2. The advisory covered prescription products used under medical care2.
Blood pressure and mood: smaller, less certain effects
A dose-response meta-analysis of 71 trials with 4,973 adults modelled the largest blood pressure reductions at 2 to 3 g a day of EPA plus DHA, about 2.6 mmHg systolic and 1.6 to 1.8 mmHg diastolic3. These are estimates from a statistical model across trials, not the result of one trial testing those doses, and the effects were stronger in people with high blood pressure or high blood lipids and in older adults3. The Cochrane review, by contrast, found little or no effect of long-chain omega-3 on blood pressure7.
For mood, a meta-analysis of 26 trials with 2,160 participants found a small overall benefit on depression symptoms4. Formulas that were at least 60% EPA, at an EPA dose of up to 1 g a day, showed benefit, while DHA-dominant formulas did not4. See omega-3 for depression for those trials.
Pregnancy: DHA on top of the adult baseline
In a Cochrane review of 70 trials with 19,927 women, preterm birth before 37 weeks occurred in 11.9% of women given omega-3 versus 13.4% without, and early preterm birth before 34 weeks in 2.7% versus 4.6%6. Pregnancies running past 42 weeks rose from 1.6% to 2.6%6.
The European Food Safety Authority advises an extra 100 to 200 mg a day of DHA during pregnancy on top of the 250 mg adult baseline1. The recommendations ODS summarises also advise pregnant women on vegetarian or vegan diets to ask a health care provider whether they need EPA and DHA supplements1.
How high is too high
In 7 cardiovascular outcome trials with 81,210 people, mean age 65, omega-3 supplements were linked to a 25% higher risk of atrial fibrillation5. The hazard ratio was 1.49 in trials above 1 g a day and 1.12 at 1 g a day or less, and each extra gram a day raised it by about 11%5.
The European Food Safety Authority judged long-term EPA plus DHA intakes of up to about 5 g a day to appear safe1. Doses of 2 to 15 g a day might lengthen bleeding time, and while most research finds 3 to 6 g a day of fish oil does not significantly change warfarin's effect, prescription omega-3 labels advise periodic INR checks with anticoagulants1. Common side effects are an unpleasant taste, bad breath, heartburn, nausea, stomach upset, diarrhoea and headache1.
Doses by goal, at a glance
For the full evidence table, see the omega-3 page, and to see where you stand, what an omega-3 index test shows.
What the evidence above supports, goal by goal:
- No specific health goal: 250 mg a day of EPA plus DHA is the European adult reference, or 1 to 2 seafood meals a week per the American Heart Association1.
- Existing coronary heart disease: about 1 g a day of EPA plus DHA, preferably from fish, with any supplement under a physician's direction1.
- Very high triglycerides: 4 g a day of prescription omega-3, used under medical care2.
- Blood pressure: a modelled best range of 2 to 3 g a day, for a drop of a few mmHg3.
- Depression symptoms: in trials, EPA-dominant formulas with up to 1 g a day of EPA showed benefit4.
- Atrial fibrillation, blood thinners or upcoming surgery: talk to your clinician before taking more than 1 g a day15.
Quick answers
Common questions
3 answersIs 1,000 mg of fish oil the same as 1,000 mg of omega-3?
No. A typical 1,000 mg fish oil capsule holds about 180 mg of EPA and 120 mg of DHA, or 300 mg of the omega-3s that trials count1.
Does flaxseed or chia count toward EPA and DHA?
Keep reading
Full evidence profiles
Every graded study, studied doses, interactions and safety- Fatty acidOmega-3 (fish oil, krill oil, algal oil)Omega-3 supplements supply the long-chain fatty acids EPA and DHA from fish oil, krill oil or algae, or ALA from plant oils.AGrade A
- Fatty acidKrill oilKrill oil is an omega-3 oil from Antarctic krill; much of its EPA and DHA is bound to phospholipids, and it contains astaxanthin.BGrade B
Related articles
4 articles- ArticleFish Oil After 50: Big Trials Found No Drop in Heart Events, and a Heart-Rhythm Signal Nobody MentionsDoes fish oil protect the heart, and can it cause atrial fibrillation?
- ArticleFish Oil vs Krill Oil vs Algae Oil: Which Omega-3 Is Worth Your Money?Is krill oil better than fish oil, and is algae oil as good?
- ArticleOmega-3 for Depression: A Small, EPA-Dependent Effect, and No Protection in a 5-Year TrialDoes omega-3 fish oil help with depression?
- ArticleThe Omega-3 Index Test: Where the 8% Target Comes From, Who Built It, and What Trials Say About Raising ItWhat is a good Omega-3 Index, and is the test worth it?
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7 products Paid links · we earn a commission- Quick pickMomentousMomentous Omega-3, 60 softgelsWe use this brand at home. What we useSubscribe & save 25%
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2 softgels: 800 mg EPA and 800 mg DHA; 30 servings
$39.99one-time$29.99subscribeChecked Oct 8, 2026 - MomentousMomentous Vegan Omega-3, 60 capsulesWe use this brand at home. What we useSubscribe & save 25%
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2 capsules: 1,000 mg omega-3 from algal oil (Schizochytrium sp.) with 500 mg EPA and 500 mg DHA; 30 servings
$54.99one-time$41.24subscribeChecked Oct 19, 2026 - SupersmartSuper Omega 3 (fish oil)5% off with the Supersmart newsletterGet 5% off with the newsletter (paid link, opens in new tab)
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3 softgels: 1,500 mg fish oil with 950 mg omega-3 as triglycerides (465 mg EPA, 345 mg DHA); 30 servings
$27.00one-time$22.95subscribeChecked Oct 11, 2026 - HerbsProNOW Foods Omega-3, 200 Softgels
2 softgels: 2,000 mg fish oil concentrate with 360 mg EPA and 240 mg DHA
$14.98one-timeChecked Oct 14, 2026 - Dr. TobiasDr. Tobias Triple Strength Omega 3 Fish Oil (180 softgels)
2 softgels: 2,000 mg fish oil with 1,400 mg omega-3 (800 mg EPA, 600 mg DHA), enteric-coated
$39.99one-timeChecked Oct 14, 2026 - Sports ResearchSports Research Omega-3 Fish Oil from Wild Alaska Pollock, Triple Strength 1250 mg (90 softgels)Subscribe & Save 15% + free shipping
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1 softgel: 690 mg EPA + 260 mg DHA (1,040 mg total omega-3, triglyceride form); 90 servings
$31.17one-time$26.49subscribeChecked Oct 16, 2026 - OnnitOnnit Krill Oil, 60 softgelsWe use this brand at home. What we use
CGrade C, limited (Grade C) 190 mg EPA plus DHA per serving, below the 0.5 to 5 g a day trials used (most large trials about 1 g).
Caution: Contains crustacean shellfish (krill).
2 softgels: 1 g krill oil providing 450 mg phospholipids and 240 mg omega-3 (130 mg EPA, 60 mg DHA), plus 200 mcg astaxanthin; 30 servings. Contains crustacean shellfish (krill).
$29.95one-timeChecked Oct 20, 2026
References
8 sources. Numbers in the text link here.
Sources cited in this article
8 sources- 1Omega-3 Fatty Acids: Fact Sheet for Health ProfessionalsNIH Office of Dietary Supplements, 2025
- 2Omega-3 Fatty Acids for the Management of Hypertriglyceridemia: A Science Advisory From the American Heart AssociationCirculation, 2019 · PMID 31422671
- 3Omega-3 Polyunsaturated Fatty Acids Intake and Blood Pressure: A Dose-Response Meta-Analysis of Randomized Controlled TrialsJ Am Heart Assoc, 2022 · PMID 35647665
- 4Efficacy of omega-3 PUFAs in depression: A meta-analysisTransl Psychiatry, 2019 · PMID 31383846
- 5Effect of Long-Term Marine Omega-3 Fatty Acids Supplementation on the Risk of Atrial Fibrillation in Randomized Controlled Trials of Cardiovascular Outcomes: A Systematic Review and Meta-AnalysisCirculation, 2021 · PMID 34612056
- 6Omega-3 fatty acid addition during pregnancyCochrane Database Syst Rev, 2018 · PMID 30480773
- 7Omega-3 fatty acids for the primary and secondary prevention of cardiovascular diseaseCochrane Database Syst Rev, 2020 · PMID 32114706
- 8Marine n-3 Fatty Acids and Prevention of Cardiovascular Disease and CancerN Engl J Med, 2019 · PMID 30415637
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