EPA vs. DHA: What's the Difference?

What Is Omega-3?

Omega-3 isn't just one type of fat. It's a family of fatty acids.

The three main ones are:

ALA – mainly found in plant foods
EPA – mainly found in fish and seafood
DHA – mainly found in fish and seafood

You'll find ALA in foods such as flaxseeds, chia seeds and walnuts.

EPA and DHA are commonly found in oily fish such as salmon, sardines and mackerel, as well as in fish oil supplements.

What Is EPA?

EPA stands for eicosapentaenoic acid.

It's a long-chain omega-3 fatty acid found naturally in seafood and marine oils.

EPA has been widely studied in relation to:

• Cardiovascular health
• Triglycerides
• Other aspects of cardiovascular function

This is one reason you may see EPA mentioned frequently when reading about omega-3 and heart health.

What Is DHA?

DHA stands for docosahexaenoic acid.

Like EPA, DHA is found in fatty fish and marine oils.

DHA is particularly important because it is a major structural component of cell membranes, especially in the brain and eyes.

That's why DHA often appears in conversations about brain and eye nutrition.

EPA vs. DHA: A Quick Comparison

EPA

DHA

Full name

Eicosapentaenoic acid

Docosahexaenoic acid

Main sources

Fish, seafood, fish oil

Fish, seafood, fish oil

Often discussed for

Heart & triglycerides

Brain & eye health

Found in fish oil?

Yes

Yes

Both are important omega-3 fatty acids, but they aren't identical.

Do You Need Both EPA and DHA?

For most people, there's no simple rule saying that one is always better than the other.

EPA and DHA have different roles in the body, and both are naturally found together in many types of seafood.

That's also why many omega-3 supplements contain a combination of EPA and DHA.

The right formulation depends on the product and its intended purpose.

What About ALA?

You may also see ALA mentioned when reading about omega-3.

ALA is mainly found in plant foods.

Some good sources include:

• Flaxseeds
• Chia seeds
• Walnuts
• Soybean oil
• Canola oil

ALA is an essential fatty acid, which means your body needs to get it from your diet.

Your body can convert some ALA into EPA and DHA, but the conversion is limited.

This is why eating foods that directly contain EPA and DHA, such as fatty fish, can be a useful way to increase your intake of these particular omega-3s.

Why Is DHA Associated With Brain Health?

DHA is found in high amounts in the brain and plays an important structural role there.

Because of this, researchers have studied DHA in relation to:

• Brain development
• Cognitive function
• Neurological health

But there's an important distinction:

The fact that DHA is important to the brain doesn't mean that taking more DHA automatically improves memory or prevents brain-related diseases.

Research on supplementation depends on the person's age, health, diet, amount consumed and other factors.

Why Is EPA Associated With Heart Health?

EPA has been extensively studied in cardiovascular research.

Researchers have looked at its relationship with:

• Triglycerides
• Cardiovascular events
• Heart health
• Other cardiovascular processes

However, different studies have produced different results, particularly when comparing different omega-3 products and doses.

That's why it's better to look at the specific product and research rather than assuming that every omega-3 supplement works in exactly the same way.

Is a Higher EPA or DHA Amount Always Better?

Not necessarily.

You may see products advertised as having a very high amount of EPA or DHA, but more isn't automatically better for everyone.

The amount you need depends on factors such as:

• Your diet
• Your nutritional needs
• Your health
• The reason you're taking the supplement

If you're taking medication or have an existing health condition, it's a good idea to ask a healthcare professional before making significant changes to your supplement routine.

How to Read an Omega-3 Label

This is one of the most useful things to understand when shopping for fish oil.

Imagine you see this on the front of a bottle:

Fish Oil – 1,000 mg

It sounds like a lot.

But turn the bottle around and you might find:

EPA – 180 mg
DHA – 120 mg

That means you're getting 300 mg of EPA + DHA from 1,000 mg of fish oil.

Another product could contain the same amount of fish oil but a different amount of EPA and DHA.

So when comparing omega-3 supplements, don't look only at the big "fish oil" number.

Check the EPA and DHA amounts.

Should You Get EPA and DHA From Food?

Food is always an important place to start.

Fatty fish such as salmon, sardines and mackerel naturally provide EPA and DHA, along with protein and other nutrients.

If you don't eat fish regularly, an omega-3 supplement can be a convenient way to add EPA and DHA to your diet.

So, Which One Is Better: EPA or DHA?

There's no universal answer.

EPA and DHA are two different omega-3 fatty acids, and both have been studied extensively.

Instead of asking which one is "better," it's more useful to understand what each one is and why it's included in your supplement.

When choosing an omega-3 product, look at:

• EPA content
• DHA content
• Total omega-3 content
• Serving size
• Product quality

The Bottom Line

EPA and DHA are two important types of marine omega-3.

EPA is commonly discussed in relation to cardiovascular health and triglycerides, while DHA is particularly important as a structural component of the brain and eyes.

Both can be obtained from fatty fish and are commonly found in omega-3 supplements.

The next time you pick up a bottle of fish oil, don't just look at the total fish oil amount.

Turn the bottle around and check the EPA and DHA.