EPA vs DHA: What’s the Difference and Why Do You Need Both?

When you see “Omega-3” on a supplement label, it’s easy to assume it’s just one nutrient. In reality, Omega-3 is a family of essential fatty acids, with EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid) being the two most important long-chain forms. Although they often appear together, when you look at EPA vs DHA, they have different roles in the body—and understanding these differences can help you choose the right supplement for your needs.

DHA: The Structural Omega-3

Think of DHA as the body’s building block.
It is a major structural component of the brain and retina, making it especially important throughout every stage of life.
DHA:

• Is highly concentrated in the brain and eyes.
• Contributes to the maintenance of normal brain function.*
• Contributes to the maintenance of normal vision.*
• Is particularly important during pregnancy and early childhood, when the brain and eyes are developing rapidly.**

Because the body produces very little DHA on its own, it must come from food or supplements.

EPA: The Functional Omega-3

While DHA is a key structural component, EPA is involved in many of the body’s everyday physiological processes.
EPA:

• Works alongside DHA to support the normal function of the heart.*
• Is commonly included in Omega-3 supplements alongside DHA because the two fatty acids complement one another.
• Is naturally found in oily fish and marine algae.

Rather than acting as a building block like DHA, EPA plays a more active role in the body’s ongoing functions.

Why Are EPA and DHA Often Taken Together?

Although EPA and DHA have different roles, they work best as a team.

Many high-quality Omega-3 supplements provide both fatty acids because they support different aspects of health:
🧠 DHA – supports normal brain function and helps maintain normal vision.*
❤️ EPA + DHA – together contribute to the normal function of the heart.*

Including both in your daily routine can help ensure you’re getting a balanced source of these essential Omega-3 fats.

Fish Oil vs Algae: Where Do EPA and DHA Come From?

Many people associate EPA and DHA with fish, but fish don’t produce these fatty acids themselves. They obtain them by eating marine algae, which is the original source of Omega-3.
Today, advances in nutrition mean EPA and DHA can be sourced directly from sustainably grown marine algae, providing a vegan-friendly alternative to traditional fish oil—without the fishy taste or odour.

Supporting Your Daily Omega-3 Intake

At AvaCare, our Adult Omega-3 Super Plant Strength provides both DHA and EPA from sustainably sourced marine algae, making it an easy way to support your daily Omega-3 intake while following a vegan or plant-based lifestyle.

* Authorised health claims: DHA contributes to the maintenance of normal brain function and normal vision. EPA and DHA contribute to the normal function of the heart. The beneficial effects are obtained with a daily intake of 250 mg of DHA, or 250 mg of EPA and DHA, respectively.

** Maternal intake of DHA contributes to the normal brain and eye development of the baby and breastfed infants. The beneficial effect is obtained with a daily intake of 200 mg DHA in addition to the recommended daily intake of 250 mg EPA and DHA.