Most healthy adults benefit from 250 to 500 mg of combined EPA and DHA per day, the two omega-3 fatty acids your body actually uses. That’s roughly what you’d get from two servings of fatty fish per week. But the right amount for you depends on your goals, whether you’re pregnant, and whether you’re managing a specific health condition.
General Intake for Healthy Adults
The baseline target most health organizations agree on is at least 250 mg of combined EPA and DHA daily. Many guidelines round this up to 500 mg for broader cardiovascular support. You can hit this range by eating fatty fish like salmon, mackerel, sardines, or trout twice a week, or by taking a fish oil supplement.
One important detail that trips people up: a “1,000 mg fish oil” capsule does not contain 1,000 mg of EPA and DHA. Much of that capsule is other fats your body doesn’t use the same way. You need to flip the bottle over and add up the EPA and DHA lines specifically. Many standard capsules deliver only 300 to 400 mg of combined EPA and DHA, meaning you’d need two or three pills to reach 1,000 mg.
Omega-3 Needs During Pregnancy
Pregnant and breastfeeding women need more DHA specifically, because it plays a central role in fetal brain and eye development. The baseline recommendation is at least 250 mg of combined EPA and DHA daily, plus an additional 100 to 200 mg of DHA on top of that.
Women with low DHA intake or low blood levels face a higher risk of preterm birth. For those women, research supports a higher dose of roughly 600 to 1,000 mg per day of DHA alone or combined EPA and DHA. Randomized controlled trials at this dosage showed significant reductions in both preterm and early preterm birth. If you’re pregnant and unsure about your current intake, a prenatal supplement with at least 200 to 300 mg of DHA is a reasonable starting point.
Higher Doses for Heart Health
For people with elevated triglycerides, therapeutic doses are significantly higher than general wellness amounts. Prescription omega-3 products typically deliver 2 to 4 grams of EPA and DHA daily. These doses can lower triglyceride levels by 20 to 30 percent, but they come with a greater risk of side effects like fishy burps, digestive discomfort, and increased bleeding time. Doses in the 2 to 15 gram range can reduce platelet clumping, which is why people on blood thinners need to be cautious at high intakes.
For general heart health without a specific lipid problem, 500 to 1,000 mg of combined EPA and DHA daily is the range most commonly referenced in prevention guidelines.
Doses Studied for Mood Support
If you’re exploring omega-3s for depression or low mood, the research points to EPA as the more relevant fatty acid, not DHA. Clinical trials consistently show that formulations where EPA makes up at least 60% of the total omega-3 content perform better for mood than balanced or DHA-heavy supplements.
The effective dose range in studies is typically 1 to 2 grams of EPA per day, though benefits have appeared at doses as low as 500 mg in certain groups. A practical rule of thumb is to look for a supplement with at least a 2:1 ratio of EPA to DHA if mood support is your primary goal.
Why Plant-Based Omega-3s Don’t Substitute Equally
Flaxseed, chia seeds, and walnuts are rich in ALA, the plant form of omega-3. ALA is an essential nutrient, but your body has to convert it into EPA and DHA before it can do much of the work these fats are known for. That conversion is inefficient. In men, roughly 8% of ALA converts to EPA and somewhere between 0 and 4% becomes DHA. Women convert more efficiently, at about 21% to EPA and 9% to DHA, likely due to the influence of estrogen.
This means that if you rely entirely on plant sources, you’d need to consume large amounts of ALA to match even a modest serving of salmon. A tablespoon of flaxseed oil contains around 7,000 mg of ALA, but after conversion, a man might get roughly 560 mg of EPA and very little DHA from it. If you don’t eat fish, an algae-based EPA and DHA supplement is a more reliable way to meet your needs directly.
Safety and Upper Limits
No formal upper limit has been set for omega-3s. Both the FDA and the European Food Safety Authority have concluded that combined EPA and DHA supplements up to 5 grams per day are safe for long-term use. That said, higher doses do carry real trade-offs. At around 900 mg of EPA plus 600 mg of DHA daily for several weeks, there’s evidence of reduced immune function because omega-3s suppress some inflammatory pathways. At 2 grams and above, bleeding time can increase.
For most people taking a standard supplement of 500 to 1,000 mg combined EPA and DHA, the main side effects are minor: fishy aftertaste, mild nausea, or loose stools. Taking capsules with a meal that contains some fat improves absorption and usually reduces these issues.
How to Read a Supplement Label
The single most common mistake with omega-3 supplements is looking at the total fish oil number on the front of the bottle instead of the EPA and DHA breakdown on the back. Here’s what to check:
- EPA line: Listed in milligrams on the Supplement Facts panel.
- DHA line: Listed separately, just below EPA.
- Serving size: Often two capsules, not one, so double-check before doing the math.
Add the EPA and DHA numbers together for your total active omega-3 per serving. If a serving gives you 360 mg EPA and 240 mg DHA, that’s 600 mg of useful omega-3. You’d need nearly two servings to reach 1,000 mg. Higher-concentration supplements are available that pack 500 to 700 mg of combined EPA and DHA into a single softgel, which cuts down on pill count.
Salmon remains the richest whole-food source of omega-3, with roughly double the EPA and DHA content of the next best options like trout or snapper. If you eat a 3.5-ounce serving of wild salmon, you’re getting somewhere around 1,500 to 2,000 mg of combined EPA and DHA in one sitting, far more than a typical capsule provides. Tilapia, on the other end, contains almost no omega-3 at all.