How much omega-3 per day, by goal

1. 01

   General health: 250-500 mg EPA+DHA per day

   The everyday target most guidance converges on is 250-500 mg of combined EPA+DHA per day for cardiovascular maintenance (NIH ODS; Mozaffarian & Rimm 2006). This is not a formal RDA, since the body makes some omega-3 from plant ALA, but it is the practical floor for the long-chain forms that do the work. It is met by about two servings of oily fish per week, which is why the fish-first route is the default and a supplement only fills the gap.

2. 02

   There is no RDA, only an adequate intake for ALA

   Unlike vitamin D or magnesium, omega-3 has no RDA. Agencies set an adequate intake for the plant precursor ALA: 1.6 g/day for men and 1.1 g/day for women (NIH ODS). But ALA converts to the active EPA and DHA at only ~5-10%, so hitting the ALA number with flax does not guarantee an adequate EPA+DHA supply. This is why the useful daily number is a direct EPA+DHA intake, not the ALA figure on a chia label.

3. 03

   Read the EPA+DHA line, not the fish-oil weight

   The most common dosing error is counting the wrong number. A softgel labeled '1000 mg fish oil' is often only ~300 mg EPA+DHA, the rest being other fats. To reach a 500 mg/day general-health target from that product takes two softgels; a concentrated product with 600-900 mg EPA+DHA per softgel hits it in one. Always dose to the supplement facts EPA+DHA line. Our best-fish-oil ranking prices products on $/mg of EPA+DHA precisely because the headline weight misleads.

4. 04

   Lowering triglycerides: 2-4 g/day, under a clinician

   The dose that produces the strongest clinical effect is far higher than the maintenance number. At 2-4 g/day of EPA+DHA, omega-3 lowers blood triglycerides by ~15-30% in a dose-dependent way (Skulas-Ray et al. 2019, AHA advisory), which is why prescription omega-3 products exist for severe hypertriglyceridemia. This is a therapeutic dose tied to a measured lipid problem and clinician oversight, not an open-ended self-dose for general wellness.

5. 05

   The upper bound, and why more is not better

   The FDA considers up to 3 g/day of EPA+DHA from supplements generally recognized as safe. Above that, the tradeoffs appear: very high intakes can prolong bleeding time, and some trials (including high-dose EPA arms) reported a modest increase in atrial fibrillation. General-health intake (250-500 mg/day) carries none of these concerns. The dose-response for triglycerides plateaus in the low grams, so pushing past a few grams a day without a clinical reason adds risk, not benefit.

6. 06

   Fish first, supplement the gap, price the active dose

   The lowest-cost route to the 250-500 mg/day target is roughly two servings of oily fish weekly: a single 100 g portion of salmon supplies ~1,500-2,000 mg EPA+DHA, so two servings a week averages well over 250 mg/day. If fish intake is low, a supplement closes the gap. Vegetarians and vegans use algae oil, the only plant source of preformed EPA+DHA. When buying, compare on $/mg of EPA+DHA in our best-fish-oil ranking, and see foods-high-in-omega-3 for the fish-first math.

What people ask us next.

Q01

How much omega-3 should I take per day?

For general health, 250-500 mg of combined EPA+DHA per day, met by about two servings of oily fish weekly or a supplement (NIH ODS; Mozaffarian & Rimm 2006). There is no formal RDA; agencies set only an adequate intake for the plant precursor ALA (1.6 g/day men, 1.1 g/day women), which converts to active EPA and DHA at just ~5-10%. Lowering triglycerides therapeutically takes 2-4 g/day under a clinician.

Q02

Is 1000 mg of fish oil the same as 1000 mg of omega-3?

No, and this is the most common dosing mistake. A softgel labeled '1000 mg fish oil' is often only ~300 mg EPA+DHA, the active omega-3; the rest is other fats. Always read the EPA+DHA line on the supplement facts panel, not the headline weight. To hit a 500 mg/day target from a 300 mg-per-softgel product takes two softgels. Our best-fish-oil ranking prices products by $/mg of EPA+DHA for exactly this reason.

Q03

How much omega-3 per day to lower triglycerides?

2-4 g/day of combined EPA+DHA, which lowers triglycerides by ~15-30% in a dose-dependent way (Skulas-Ray et al. 2019, AHA science advisory). This is the dose used in prescription omega-3 products for severe hypertriglyceridemia. Because it is roughly 5-10x the general-health intake and is tied to a measured lipid problem, it belongs under clinician oversight, not open-ended self-dosing.

Q04

Can you take too much omega-3?

Yes. The FDA considers up to 3 g/day of EPA+DHA from supplements generally safe. Above that, very high intakes can prolong bleeding time and, in some trials, modestly raised atrial fibrillation risk. The triglyceride benefit plateaus in the low grams, so pushing well past a few grams a day without a clinical reason adds risk without added benefit. General-health intake of 250-500 mg/day carries none of these concerns.

Q05

How much omega-3 do I get from eating fish instead?

Enough to skip a supplement if you eat oily fish twice a week. A single 100 g serving of salmon supplies ~1,500-2,000 mg EPA+DHA, and sardines or mackerel are similar, so two servings weekly average well over the 250 mg/day general-health target. This is the lowest-cost route; see foods-high-in-omega-3 for the per-serving numbers and what does omega-3 do for why the target matters.

Q06

How much omega-3 per day for a vegetarian or vegan?

The same 250-500 mg/day EPA+DHA target applies, but the source changes. Flax, chia, and walnuts supply only ALA, which converts to EPA and DHA at ~5-10% (NIH ODS), so they are not a reliable EPA+DHA source. Algae oil is the only plant source of preformed EPA+DHA and is the vegan route to the target; price it against fish oil on $/mg of EPA+DHA in our best-fish-oil ranking.