What are omega-3 fatty acids? Everything you need to know

In the world of nutrition, omega-3 fatty acids have earned a solid reputation. Whether it’s fish oil supplements or flaxseed, these healthy fats show up again and again in conversations around wellness, and not without reason.

Known for their role in supporting heart, brain, and eye health, omega-3s are essential nutrients. But what exactly are they? How do they work? And how much do you actually need? Here’s a science-backed guide to help you understand the real benefits of omega-3s, without the jargon.

Omega-3s are a family of polyunsaturated fatty acids, meaning they’re fats your body can’t produce on its own. This makes them essential, you need to get them from food or supplements.

There are three main types:

ALA (alpha-linolenic acid) – Found in flaxseeds, chia seeds, walnuts, and hemp.
EPA (eicosapentaenoic acid) – Mostly from oily fish like sardines, salmon, and mackerel.
DHA (docosahexaenoic acid) – Also found in fish and especially important for brain and eye health.

While your body can convert ALA into EPA and DHA, that process is inefficient, often less than 10%. ¹ That’s why direct sources of EPA and DHA are recommended for those who want to support specific areas of health.

How omega-3s support heart health

Heart health is one of the most widely studied areas when it comes to omega-3s. Research suggests that regular intake of EPA and DHA may help maintain normal blood pressure, support healthy triglyceride levels and reduce the risk of certain cardiovascular events. ²

According to studies, individuals who consumed higher levels of omega-3s had a reduced risk of heart attacks and other coronary events. ³ While they’re not a replacement for medication or lifestyle changes, omega-3s can be a supportive addition to an overall heart-healthy routine.

Omega-3s and your brain

The brain is rich in fat, and DHA is one of the most abundant types found in the central nervous system. This makes omega-3s especially important for cognitive function and development.

During pregnancy and early childhood, omega-3s play a key role in brain development and vision. Studies have shown that maternal intake of DHA is linked to improved cognitive and visual outcomes in infants. ⁴

In adults, omega-3s may support mental sharpness and help maintain memory as we age. Some research even indicates a potential benefit for mood balance, particularly when it comes to EPA, which has been studied in the context of depression and other mood disorders. ⁵ It’s not a cure, but it may be part of a broader strategy for mental wellbeing.

Eye, joint and immune health

Beyond the heart and brain, omega-3s contribute to several other important areas of health. DHA is a structural component of the retina, and some studies suggest that omega-3 intake may help reduce the risk of age-related macular degeneration. ⁶

Omega-3s also play a role in managing inflammation. Chronic inflammation has been linked to several long-term health conditions, and omega-3s are thought to help regulate the body's inflammatory response. ⁷ This has led to interest in their role in joint health, particularly for people living with conditions like rheumatoid arthritis.

If you’re interested in reading more about joint health, check out our blog on Glucosamine for Joint Health.

What about plant-based omega-3s?

If you follow a vegetarian or vegan diet, getting enough omega-3s can be a bit more challenging, but not impossible.

ALA is found in good quantities in foods like flaxseeds, chia seeds, walnuts, and hemp oil. However, because the body doesn’t convert ALA into EPA and DHA very efficiently, some people opt for supplements. These offer a direct source of DHA (and sometimes EPA), without using animal products.

How much EPA and DHA do you need?

There’s no one-size-fits-all number, but most health organisations suggest aiming for:

250–500 mg per day of combined EPA and DHA for general health.
Up to 1000 mg or more daily for individuals managing specific health concerns, under medical supervision.

For reference, a typical serving of fatty fish (like salmon) contains about 1000–1500 mg of EPA and DHA combined. Eating oily fish two to three times a week is usually enough to meet most people’s needs.

If fish isn’t part of your routine, high-quality supplements, including fish oil, flaxseed or hemp oil, can help fill the gap. As always, it’s a good idea to consult with your doctor, especially if you're on blood thinners or other medication.

Explore Zipvit’s range of Omega 3 and Fish Oil supplements here.

Are there risks or side effects?

For most people, omega-3 supplements are well tolerated. Mild side effects like a fishy aftertaste or stomach upset can occur, especially with lower-quality oils.

High doses, typically over 3000 mg per day, may increase the risk of bleeding or interact with certain medications, so it’s best to stay within recommended limits unless advised otherwise. ⁸

A simple step with wide-ranging benefits

Omega-3 fatty acids are more than just a nutrition trend. From supporting heart and brain health to maintaining vision, joint comfort and inflammation balance, these essential fats play a critical role in long-term wellbeing.

If you’re not getting enough through your diet, adding a high-quality omega-3 supplement, or including more oily fish, could be a practical and effective step. And as always, the biggest impact comes when these habits are part of a bigger picture that includes balanced eating, movement and regular check-ups with your doctor.