How much omega-3 per day do you need? There is no official daily requirement for EPA and DHA, the two omega-3s found in fish. Many expert groups point healthy adults toward roughly 250 to 500 mg of EPA plus DHA a day, which is about what two servings of fatty fish a week provide. Supplements, including fish oil, are one way to fill the gap when fish is not on your plate.
The numbers get confusing quickly, because labels mix up fish oil, total omega-3s, EPA and DHA. This guide explains which number matters, what food gives you, and how to read a supplement label without doing mental math.
Key takeaways
- There is no official daily requirement for EPA and DHA, the two omega-3s found in fish.
- When comparing fish oils, add up the EPA and DHA lines instead of reading the total fish oil amount.
- The Dietary Guidelines for Americans suggest about 8 ounces of seafood a week for most adults.
- Follow the label rather than doubling up, and ask your healthcare provider before taking higher amounts.
What are the three types of omega-3?
Omega-3s are a family of fats your body cannot make in useful amounts on its own, so they come from food or supplements. Three matter most:
- ALA (alpha-linolenic acid) comes from plants such as flaxseed, chia, walnuts and canola oil. It is the only omega-3 with an official intake level: the Adequate Intake for adults is 1.1 to 1.6 grams a day, depending on sex.
- EPA (eicosapentaenoic acid) comes mainly from fatty fish and seafood.
- DHA (docosahexaenoic acid) also comes mainly from fish and seafood, and it is concentrated in the brain and the eye.
Your body converts only a small share of ALA into EPA and DHA, which is why fish and fish oil are the direct sources most people talk about. For a closer look at the two, see EPA vs. DHA: what is the difference.
How much omega-3 per day do adults need?
For EPA and DHA, NIH's Office of Dietary Supplements is clear that no official recommended amount has been set. What exists instead is guidance built around food.
| Source of guidance | What it says |
|---|---|
| Dietary Guidelines for Americans | About 8 ounces of a variety of seafood a week for most adults |
| Many international expert groups | Roughly 250 to 500 mg of EPA plus DHA a day for healthy adults |
| NIH ODS (ALA only) | 1.1 to 1.6 g a day for adults |
| FDA (supplements) | Up to 5 g a day of EPA plus DHA combined from supplements is not expected to cause safety concerns |
The Dietary Guidelines for Americans suggest about 8 ounces of seafood a week for most adults. Two servings of salmon, sardines, trout or anchovies a week gets most people into that 250 to 500 mg daily average.
Which number on a fish oil label matters?
The number that matters on a label is EPA plus DHA, not the total amount of fish oil. A softgel can contain a large amount of fish oil and still deliver modest EPA and DHA, because fish oil also contains other fats. When you compare labels, look for three lines:
- Serving size. Is the serving one softgel, two, or more? Every number below it is for that whole serving.
- Total omega-3. This is the combined omega-3 content of the serving.
- EPA and DHA. Add them together. That sum is the figure to compare against the 250 to 500 mg guidance.
As an example, Pure Omega+™ lists 2,400 mg of fish oil per two-softgel serving, with 1,440 mg of omega-3 fatty acids made up of 864 mg EPA and 576 mg DHA. The suggested use is two softgels daily with meals, so the bottle of 60 lasts 30 days. Our guide Inside Pure Omega+ walks through that label line by line.
Is more omega-3 better?
More is not automatically better, and higher amounts are a conversation to have with your healthcare provider. Research on larger doses usually involves people under medical supervision, and fish oil can interact with medicines that affect blood clotting. NCCIH also notes that omega-3 supplements may cause mild digestive side effects such as an unpleasant taste, bad breath, heartburn and nausea.
Some sensible ground rules:
- Follow the label's suggested use rather than doubling up.
- Count fish you already eat. If you eat salmon three times a week, your needs from a supplement may be smaller.
- Talk to your provider first if you are pregnant or nursing, take medication, or have a known medical condition.
Food first, then fill the gap
Fatty fish brings protein, vitamin D, selenium and other nutrients along with omega-3s, so it is worth eating when you can. The FDA's advice about eating fish favors lower-mercury choices such as salmon, sardines, anchovies, trout and pollock. A supplement makes sense when fish is not a regular part of your week, or when you want a steady, measured amount every day. Our article on heart-healthy habits covers the bigger picture of food, movement and sleep.
If you choose a supplement, look for one that is tested by an outside lab. Every batch of Pure Omega+ is third-party tested for purity and potency, and it is bottled in an NSF-certified, GMP-certified, FDA-registered U.S. facility. You can read more about how we test on our standards page.
Frequently asked questions about how much omega-3 per day
Is 1,000 mg of fish oil the same as 1,000 mg of omega-3?
No. Fish oil is the whole oil, and omega-3s are only part of it. Always check the EPA and DHA lines on the Supplement Facts panel, and add them together to compare products fairly.
Can I get enough omega-3 from plant foods?
Plant foods give you ALA, which has its own intake level. Your body turns only a small share of ALA into EPA and DHA, so people who eat no fish often look to fish oil or algae oil for those two. Our guide to fish oil vs. algae oil compares the options.
Should I take omega-3 every day?
Omega-3 supplements are designed for daily use as directed on the label. Consistency matters more than timing, and taking softgels with a meal makes them easier on the stomach.
Does cooking destroy omega-3 in fish?
Baking, grilling and poaching keep most of the omega-3 content of fish. Deep frying adds other fats and can reduce the benefit of the meal, so gentler cooking methods are a good default.
Who should be careful with omega-3 supplements?
Anyone who takes medicine that affects blood clotting, anyone with a fish allergy, and people who are pregnant or nursing should talk with a healthcare provider before starting. Fish oil softgels also contain fish, so check the allergen line.
Related reading from our Wellness Hub
- Fish Oil vs. Algae Oil: Which Omega-3 Source Fits You?
- How to Choose a Fish Oil Supplement: Five Label Details That Matter
Sources
- NIH Office of Dietary Supplements: Omega-3 Fatty Acids, Fact Sheet for Health Professionals
- NCCIH: Omega-3 Supplements: What You Need To Know
- Dietary Guidelines for Americans
- FDA: Advice about Eating Fish
Individual results vary.
*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.
