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Is Omega-3 the Same as Fish Oil
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Is Omega-3 the Same as Fish Oil? Key Differences Explained
Apr 15, 2026 | 5 min read

Roughly 1 in 10 American adults takes an omega-3 or fish oil supplement. But is omega-3 the same as fish oil? If not, what's the difference between fish oil and omega-3, and is one better than the other?

We'll answer these questions ahead, offering a simple explainer on omega-3 versus fish oil and why people often confuse the two. We'll also go over the 3 main types of omega-3 fatty acids, what they do, and where the nutrients are sourced.

What Is Omega-3?

Omega-3 refers to omega-3 fatty acids, sometimes called healthy fats. They're a type of fatty acid classified as omega-3 polyunsaturated fatty acids (or PUFAs). Your body relies on omega-3s for survival and functioning but can't produce enough on its own. This is why some people take dietary supplements if they can't get enough PUFAs from food.1

Types of Omega-3 Fatty Acids

The 3 main types of omega-3 fatty acids are:

  • EPA – EPA is short for eicosapentaenoic acid
  • DHA – DHA stands for docosahexaenoic acid
  • ALA – ALA is alpha-linolenic acid

You can get these fatty acids from various food sources, like fresh fish, flax seeds, chia seeds, walnuts, or edamame (soybeans). But fish oil is one of the best sources of EPA and DHA.2

Omega-3 Benefits

So, what can fish oil do? The potential benefits of omega-3 fatty acids are wide-ranging. EPA, DHA, and ALA support cell structure and functioning. This allows the fatty acids to help with1,3:

  • Maintaining immune function
  • Supporting cardiovascular and heart health
  • Managing healthy circulation
  • Supporting triglyceride (fats in the blood) levels already in a healthy range
  • Supporting brain health and cognitive function

The right doses of omega-3 depend on your health goals. Ask your healthcare provider before starting omega-3 supplementation.

What Is Fish Oil?

Fish oil is a nutritional oil derived from fish. It provides the body with essential PUFAs in the form of omega-3 fatty acids. Fish oil is considered an excellent source of DHA and EPA but generally only contains a small amount of ALA.4

Where Fish Oil Comes From

Fish oil comes from various types of oily fish (also known as fatty fish). Some of the most common sources include salmon, mackerel, cod, tilapia, sardines, herring, and anchovies.2

Ideally, you want a fish oil supplement to be certified by the International Fish Oil Standards (IFOS). Some of XYMOGEN omega-3 softgels have an industry-leading 5-star rating with IFOS, ensuring they're made from high-quality sources and tested for purity.

Why Fish Oil Is Used as a Supplement

Fish oil is used as an omega-3 supplement because it's a prime source of EPA and DHA. Fish oil softgels, like those from XYMOGEN, deliver absorbable forms of these omega-3s, so they can get into cells and be used by the body.2,5

Are Omega-3 and Fish Oil the Same?

The simple explanation: Omega-3 and fish oil aren't the same thing. Fish oil is a source of omega-3 fatty acids. Omega-3s can come from sources other than fish, like seeds or soybeans.

Why People Confuse the Two

People often confuse fish oil and omega-3 supplements and use the words interchangeably. Why? Many omega-3 supplements contain fish oil as the primary source of omega-3 fatty acids.

What's the Difference Between EPA, DHA, and ALA?

Let's explore EPA, DHA, and ALA a bit more.

EPA: What It Does

EPA can be sourced from fatty fish and algae oil. This omega-3 fatty acid may help lower oxidative stress from free radicals, support the immune system, and maintain heart health.6

DHA: What It Does

DHA is also primarily sourced from fatty fish and algae oil. This omega-3 is thought to support brain health and promote heart health.6,7

ALA: How It Converts

ALA mostly comes from plant sources, such as chia seeds, walnuts, flaxseed oil, and soybean oil. This short-chain fatty acid can be converted into the long-chain fatty acids EPA and DHA. But conversion isn't always efficient in the body, which is why many people eat fish or take fish oil supplements.2,8

Is Fish Oil the Best Source of Omega-3?

Fish oil is often considered the best source of omega-3 in supplement form.9 The American Heart Association (AHA) says eating fresh fish 2 or more times a week is the ideal way to get enough omega-3 fatty acids. But if you can't consume fish that often (or don't like it), taking omega-3 supplements can be a good alternative.10

Fatty seafood and fish oil are great sources of EPA and DHA.8 To get ALA, you may want to eat more nuts and seeds or take a flax oil supplement.2

Which Should You Take: Omega-3 or Fish Oil?

You don't actually have to choose between omega-3 and fish oil. Fish oil is one of the best omega-3 sources, particularly DHA and EPA, which offer a medley of health benefits when taken consistently.

XYMOGEN is a trusted source of high-quality, third-party tested fish oil supplements. Our softgels deliver a concentrated, absorbable, bioavailable source of DHA and EPA omega-3s to support overall wellness. Shop the collection today.

References:

  1. Cleveland Clinic. Omega-3 fatty acids. Accessed April 21, 2026. https://my.clevelandclinic.org/health/articles/17290-omega-3-fatty-acids
  2. National Institutes of Health (NIH) Office of Dietary Supplements (ODS). Omega-3 fatty acids. Accessed April 21, 2026. https://ods.od.nih.gov/factsheets/Omega3FattyAcids-HealthProfessional/
  3. Clinical Nutrition ESPEN. Role of omega-3 fatty acids eicosapentaenoic (EPA) and docosahexaenoic (DHA) as modulatory and anti-inflammatory agents in noncommunicable diet-related diseases – reports from the last 10 years. Accessed April 21, 2026. https://www.sciencedirect.com/science/article/pii/S2405457724001992
  4. Mayo Clinic. Fish oil. Accessed April 21, 2026. https://www.mayoclinic.org/drugs-supplements-fish-oil/art-20364810
  5. Canadian Medical Association Journal (CMAJ). The science behind dietary omega-3 fatty acids. Accessed April 21, 2026. https://pmc.ncbi.nlm.nih.gov/articles/PMC2174995/
  6. Journal of Orthopaedic Surgery and Research. Effect of omega-3 polyunsaturated fatty acids supplementation for patients with osteoarthritis: a meta-analysis. Accessed April 21, 2026. https://pmc.ncbi.nlm.nih.gov/articles/PMC10210278/
  7. Journal of the American Medical Association (JAMA). Docosahexaenoic acid supplementation and cognitive decline in Alzheimer disease: a randomized trial. Accessed April 21, 2026. https://pubmed.ncbi.nlm.nih.gov/21045096/
  8. Molecular Nutrition & Food Research. Immunomodulatory effects of omega‐3 fatty acids: mechanistic insights and health implications. Accessed April 21, 2026. https://pmc.ncbi.nlm.nih.gov/articles/PMC12087734/
  9. BMJ Medicine. Regular use of fish oil supplements and course of cardiovascular diseases: prospective cohort study. Accessed April 21, 2026. https://bmjmedicine.bmj.com/content/3/1/e000451
  10. Arteriosclerosis, Thrombosis, and Vascular Biology. Omega-3 fatty acids and cardiovascular disease: new recommendations from the American Heart Association. Accessed April 21, 2026. https://www.ahajournals.org/doi/10.1161/01.atv.0000057393.97337.ae