EPA—short for eicosapentaenoic acid—is a long-chain omega-3 fatty acid found mainly in marine foods such as oily fish and microalgae. (This page is about the nutrient; it is not related to the U.S. Environmental Protection Agency, which shares the same abbreviation.) Understanding your EPA sources matters because this fatty acid is one of the key omega-3s in human nutrition, yet many people eat little of the seafood that supplies it. This overview explains what EPA is, which foods and supplements provide it, how it differs from DHA and ALA, and what to consider when choosing between EPA sources.
What Is EPA?
Eicosapentaenoic acid (EPA) is one of the two main long-chain omega-3 fatty acids in the human diet, together with docosahexaenoic acid (DHA). Both are found naturally in fatty fish and algae, and both are used throughout the body, including as components of cell membranes. EPA is often studied for its role in inflammatory processes and cardiovascular markers, and it is frequently discussed alongside—but distinctly from—DHA, which is especially concentrated in the brain and eyes. Because the two fatty acids do not play identical roles, the source of your omega-3s, and how much EPA it delivers alongside DHA, can matter when evaluating foods and supplements.
EPA vs. DHA vs. ALA
Omega-3 fatty acids come in three main forms. ALA (alpha-linolenic acid) is the plant-based form, found in foods such as flaxseed, chia seeds, walnuts and hemp seeds. EPA and DHA are the marine forms, found in fish, seafood and algae. The body can convert some ALA into EPA, but this conversion is limited and varies considerably from person to person, which is why ALA-rich plant foods alone are generally considered an unreliable route to meaningful EPA intake. Direct sources—oily fish, seafood, algal oil and marine-based supplements—provide EPA in its ready-to-use form.
The Best Food Sources of EPA
When people ask what foods are rich in EPA, the answer almost always starts with small, oily cold-water fish. These fish accumulate omega-3s in their tissue and consistently rank among the foods with the highest EPA content. The list below gives typical approximate EPA values per 100 g, based on common food-composition data. Actual amounts vary with species, season, wild or farmed origin and cooking method.
- Mackerel (Atlantic): approximately 0.9 g of EPA per 100 g
- Herring: approximately 0.7–1 g of EPA per 100 g
- Salmon: approximately 0.5–1 g of EPA per 100 g, depending on the species and whether it is farmed or wild
- Anchovies: approximately 0.5–1.4 g of EPA per 100 g, depending on the type and preparation
- Sardines: approximately 0.4–0.5 g of EPA per 100 g, canned or fresh
A regular 100–150 g portion of any of these fish can therefore supply anywhere from a few hundred milligrams to more than a gram of EPA, which is why health organisations around the world commonly recommend eating oily fish about once or twice a week as a simple way to support omega-3 intake. Shellfish such as mussels and oysters also contribute smaller amounts of EPA and DHA.
Beyond fish and seafood, most other foods contain only modest amounts of EPA. Meat, standard eggs and most plant foods supply little or none directly: plant foods provide ALA instead, while eggs contain mainly ALA with only traces of EPA and DHA, although omega-3-enriched eggs offer somewhat more.
Plant-Based and Vegetarian EPA Sources
For people who avoid fish, microalgae is the most direct plant-based source of EPA. Microalgae are the original producers of the marine omega-3s in the aquatic food chain, and algal oil supplements made from them provide ready-made EPA—often together with DHA—without fish or fish-derived ingredients. Seaweed varieties such as nori also contain small amounts of EPA, though usually not enough to rely on as a primary source. Foods like flaxseed, chia and walnuts remain valuable parts of a plant-based diet, but as explained above they supply ALA rather than meaningful amounts of preformed EPA.
EPA Supplements: Fish Oil, Krill Oil and Algal Oil
Supplements are the other major EPA source, and they are particularly useful for people who eat little seafood, follow a vegetarian or vegan diet, or want a more concentrated and predictable intake. The three most common options differ in concentration, form and suitability.
- Fish oil – the most widely used omega-3 supplement, available in triglyceride and ethyl ester forms that differ in how the fatty acids are absorbed; the amount of EPA per capsule varies widely between products.
- Krill oil – extracted from small crustaceans and delivering omega-3s in a phospholipid form, though the EPA content per serving is often lower than in concentrated fish oils.
- Algal oil – made from microalgae and providing EPA, often with DHA, without fish-derived ingredients; the standard choice for vegetarians and vegans.
What to Look for in a Quality EPA Supplement
Whichever source you prefer, quality varies considerably between products. When comparing EPA supplements, it helps to check:
- How much EPA and DHA the label declares per serving, rather than the total amount of oil
- The form of the omega-3s, such as triglycerides or ethyl esters
- Whether the product has been third-party tested for purity, including heavy metals and oxidation
- Clear labelling of ingredients and serving sizes
You can compare EPA content, form and quality indicators across different formats in our DHA and EPA omega-3 supplements collection.
How Much EPA Do You Need?
There is no single, universally agreed daily value for EPA on its own. Many health organisations commonly reference an intake of roughly 250–500 mg of combined EPA and DHA per day for healthy adults—an amount that regular consumption of oily fish can typically provide. Individual needs vary with age, life stage, diet and health status, and some people deliberately aim for higher intakes, which is best discussed with a healthcare professional. If you take blood-thinning medication or have an existing medical condition, it is sensible to seek medical advice before starting an omega-3 supplement.
Frequently Asked Questions About EPA Sources
What are the best sources of EPA?
The best EPA sources are small oily fish—mackerel, herring, salmon, sardines and anchovies—followed by other fatty seafood. For people who avoid fish, algal oil offers a direct plant-based alternative, and fish oil, krill oil and algae oil supplements provide concentrated options.
What foods have the highest EPA?
Among common foods, oily fish top the list. Mackerel, herring and anchovies typically provide around 0.5–1 g or more of EPA per 100 g, with salmon and sardines close behind. Values vary by species, origin and preparation, so amounts are best viewed as approximate.
Are 2 eggs enough omega-3?
Two standard eggs contribute only a small amount of omega-3, and most of that is ALA rather than EPA or DHA. Even omega-3-enriched eggs generally provide far less EPA and DHA than a serving of oily fish, so eggs are best seen as a complement to other EPA sources rather than a substitute for them.
Can you get enough EPA without eating fish?
Yes—algal oil provides EPA directly from microalgae, making it possible to obtain preformed EPA without fish. Simply eating plenty of ALA-rich plant foods is a less reliable strategy, because the body converts only a limited and highly variable share of ALA into EPA.
Key Takeaways
- EPA (eicosapentaenoic acid) is a marine omega-3 fatty acid found mainly in oily fish, seafood and microalgae.
- The richest food sources are mackerel, herring, salmon, sardines and anchovies.
- ALA from plant foods converts only poorly to EPA, so direct marine or algal sources are the most dependable route.
- Fish oil, krill oil and algal oil supplements offer concentrated alternatives; EPA content per serving, form and third-party testing are the key comparison points.
- General omega-3 guidance usually refers to combined EPA and DHA intake rather than EPA alone, and individual needs vary.
The articles collected under this EPA sources tag explore individual questions in more depth, from detailed EPA vs. DHA comparisons to specific foods, intake questions and supplement choices. Browse the articles below to go deeper into any part of the topic.
