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Ingredient guide

Fish oil dosage: how much omega-3 per day?

Written by the Full Measure editorial team, which sells supplements. Approved for publication by the Full Measure owners. Updated .

Drafted with AI assistance from the sources listed below. How we write these

Quick answer

There is no official daily amount for EPA and DHA in the US. European authorities use 250 mg a day for adults, a typical 1,000 mg fish oil softgel gives about 300 mg, and FDA considers up to 5 g a day from supplements safe. Prescription omega-3 medicines use 4 g a day.1,2,3

Key facts

  • Read a label for EPA and DHA, not fish oil: 1,000 mg of a typical fish oil holds 180 mg of EPA and 120 mg of DHA.1
  • In a five-month trial, 300 to 1,800 mg a day raised the omega-3 index in step with the dose.4
  • Body weight was one of the factors that predicted how far the omega-3 index rose on a given dose.4
  • The only official US omega-3 targets are for the plant omega-3 ALA: 1.6 g a day for men and 1.1 g for women.2
  • Doses of 2 to 15 g a day might lengthen bleeding time, a reason to ask before taking large amounts.1

What official guidance says

No recommended daily amount has been set for EPA or DHA in the United States.1,2

Adequate intakes of ALA, the plant omega-3, per day1,2
WhoALA per day
Men 19 and older1.6 g
Women 19 and older1.1 g
Pregnancy1.4 g
Breastfeeding1.3 g
Teens 14 to 181.6 g for boys, 1.1 g for girls
Children 9 to 131.2 g for boys, 1.0 g for girls

The Dietary Guidelines for Americans advise adults to eat at least 8 ounces of a variety of seafood a week, including some choices higher in EPA and DHA.5

Seafood advice is given in ounces of fish rather than milligrams of EPA and DHA, because fish differ so widely. The food sources page lists how much common fish provide.

EPA and DHA: the amounts used

The European Food Safety Authority uses 250 mg a day of EPA plus DHA as its reference amount for adults.1

US adults get about 90 mg of EPA and DHA a day from food.1

Many trials of omega-3 supplements used about 1 g a day. In a 2019 analysis of 13 large trials, doses ranged from 0.376 to 4 g a day. VITAL, the largest trial in generally healthy adults, used 460 mg of EPA plus 380 mg of DHA a day.1

Prescription omega-3 medicines are taken at 4 g a day under a doctor's care. For one of them that is about 3.4 g of EPA plus DHA a day, more than ten times the 300 mg in a typical fish oil softgel.1,3

From label to dose

Fish oil labels list the total oil first and the EPA and DHA inside it below. For a typical softgel, the arithmetic works out like this.

EPA plus DHA from a typical fish oil softgel with 300 mg per softgel1,4,6
Softgels a dayEPA plus DHAFor comparison
1300 mgAbove the European reference of 250 mg
2600 mgThe amount that raised the omega-3 index by 59% in five months
3900 mgClose to the 840 mg a day used in VITAL
41.2 gAbove 1 g a day, where pooled trials found a larger rise in irregular heart rhythm

Formulations vary widely, so the same number of softgels can mean a very different dose from one product to the next. NIH advises checking labels for the types and amounts of omega-3s.1

Does a bigger dose do more?

Raises EPA and DHA levels in the blood*1,4

Strong evidence

In a five-month randomized trial in 115 healthy adults, 600 mg a day of EPA plus DHA from standard fish oil raised the omega-3 index (the share of EPA and DHA in red blood cell membranes) by 59%, with no change on placebo. NIH notes that all the common forms of omega-3 supplement raise blood EPA and DHA. Typical US intake from food is only about 90 mg a day.

Amount studied: 300 to 1,800 mg of EPA plus DHA a day; the 59% rise was at 600 mg a day for about five months

In a five-month trial of 0 to 1,800 mg of EPA plus DHA a day, the dose alone explained 68% of the differences in how much the omega-3 index rose. Adding body weight, starting level, age, sex and physical activity explained 78%.4

A larger dose lifts blood levels further, and a heavier person may need more to reach the same level. Whether a higher blood level brings other effects in healthy adults is a separate question that the large trials did not settle.4,7

Upper limits, and who should ask first

No tolerable upper intake level has been set for EPA and DHA. FDA has concluded that supplements providing no more than 5 g a day of EPA and DHA are safe when used as recommended, and the European Food Safety Authority considers long-term intakes of up to about 5 g a day to be safe.1,2

Doses of 2 to 15 g a day of EPA and DHA might lengthen bleeding time by making platelets less likely to clump.1

Doses above 1 g a day have been linked with a larger rise in atrial fibrillation, an irregular heart rhythm, than doses of 1 g or less. For people with coronary heart disease, the American Heart Association suggests about 1 g a day of EPA plus DHA, preferably from oily fish, with supplements only under a doctor's direction.1,6

  • Ask first if you take a blood thinner or an antiplatelet medicine
  • Ask first if you have a heart rhythm problem or a bleeding disorder
  • Ask first if you are pregnant, nursing or under 18
  • The 4 g a day of prescription omega-3 is a treatment for very high triglycerides, not an amount to copy with supplements3

Questions people ask

How many fish oil capsules should I take a day?

It depends on the EPA and DHA in each one. With a typical 1,000 mg softgel holding 300 mg, one gives more than the 250 mg European reference amount and two give 600 mg. Products vary widely, so read the label.1

Is 1,000 mg of fish oil the same as 1,000 mg of omega-3?

No. In a typical fish oil, 1,000 mg of oil contains 300 mg of EPA plus DHA. The rest of the oil is other fats.1

How much fish oil per day for a man?

No amount of EPA or DHA has been set for men in the US. Men need 1.6 g a day of the plant omega-3 ALA, and European authorities use the same 250 mg of EPA plus DHA for men as for women.1,2

Should I take a higher dose to lower my triglycerides?

Not on your own. The prescription products used for very high triglycerides are taken at 4 g a day under a doctor's care, and NCCIH notes that their effects may not match those of supplements.3,5

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Sources

  1. National Institutes of Health, Office of Dietary Supplements. Omega-3 Fatty Acids: Fact Sheet for Health Professionals. Updated August 22, 2025. Opened 2026-10-07.
  2. Office of Dietary Supplements, National Institutes of Health. Omega-3 Fatty Acids: Fact Sheet for Consumers. Updated July 18, 2022. Opened 2026-10-07.
  3. Omega-3-acid ethyl esters capsules: prescribing information (Waylis Therapeutics). DailyMed, U.S. National Library of Medicine. Published March 11, 2026. Opened 2026-10-07.
  4. Flock MR, et al. Determinants of erythrocyte omega-3 fatty acid content in response to fish oil supplementation: a dose-response randomized controlled trial. J Am Heart Assoc. 2013;2(6):e000513. Opened 2026-10-01.
  5. National Center for Complementary and Integrative Health, National Institutes of Health. Omega-3 Supplements: What You Need To Know. Last updated November 2024. Opened 2026-10-07.
  6. Gencer B, et al. Effect 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-Analysis. Circulation. 2021;144(25):1981-1990. Opened 2026-10-01.
  7. Manson JE, et al. Marine n-3 Fatty Acids and Prevention of Cardiovascular Disease and Cancer. N Engl J Med. 2019;380(1):23-32. Opened 2026-10-01.

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

This page is information, not medical advice. Talk to your doctor or pharmacist about your own situation.