To Omega-3 or not to Omega-3?

In the gym, you hear about it regularly. Your running buddies faithfully take it, supplement shops promote it, and it keeps popping up on health blogs: omega-3. Fish oil capsules are sometimes lauded as an important supplement for athletes. But what's really true about it?

Omega-3 fatty acids are not fundamentally a specific sports nutrition supplement. They are essential fats that everyone needs for a healthy body. Think of heart health, brain function, and regulating inflammatory processes.

Why, then, a comprehensive blog on omega-3 on a sports nutrition site? Because practice shows that many athletes are deficient in it, and because the effects are extra relevant for training individuals. If you train regularly, you demand more from your recovery and inflammation regulation. Omega-3 can help with that. Not as a miracle cure, but as part of a diet that supports your body.

What omega-3 actually is

Your body cannot produce omega-3 fatty acids itself, which is why they are called ‘essential’. There are different forms, but for athletes, two are important: EPA and DHA. You'll find these mainly in oily fish.

In addition, there is a plant-based variant (ALA) in flaxseed, walnuts, and chia seeds. The problem: your body needs to convert ALA into EPA and DHA, and this conversion is inefficient. Only 5 to 10 percent is absorbed. Those who rely mainly on plant-based sources therefore need to consume considerably more.

Why omega-3 is interesting for athletes

Recovery and muscle pain

When you train, you damage your muscles on a microscopic level. Your body repairs that damage and builds the muscles back stronger. Omega-3 helps to regulate the inflammatory processes that are involved. It doesn't stop them entirely but keeps them in balance.

A systematic review from 2024 indicated that athletes supplementing with omega-3 reported less muscle damage and faster recovery after intense training.https://pmc.ncbi.nlm.nih.gov/articles/PMC11243702/A study involving rugby players who took 1500 milligrams of omega-3 per day for five weeks showed less muscle pain and better neuromuscular performance (https://pubmed.ncbi.nlm.nih.gov/29985775/).

Heart, brain and oxygen

For endurance athletes, omega-3 supports your cardiovascular health by lowering blood pressure, keeping blood vessels supple, and reducing triglycerides (blood fats). This doesn't make you faster directly, but it lays the foundation for long-term health.

Recent research also suggests benefits in oxygen uptake, particularly in athletes with a low omega-3 status. For tactical sports, DHA can support your cognitive function and responsiveness, and may even protect against concussions in contact sports.

How much omega-3 do you need as an athlete?

For the average person, a basic recommendation of at least 250 to 500 milligrams of EPA and DHA per day applies for general health. But as an athlete who trains regularly, you demand more from your body. The scientific literature suggests that athletes benefit from higher doseshttps://www.tandfonline.com/doi/full/10.1080/15502783.2024.2441775).

Most studies demonstrating positive effects in athletes used dosages between 1500 and 2000 milligrams of EPA and DHA per dayhttps://pmc.ncbi.nlm.nih.gov/articles/PMC7760705/Some athletes even take 2000 to 3000 milligrams per day, especially during intensive training periods or when recovering from injuries. For contact sports where brain protection is relevant, even higher doses are sometimes considered.

It's important to realise: these higher dosages are mainly useful if you suffer a lot from muscle soreness, slow recovery, or train very intensely (daily or multiple sessions per day). In practice, however, you see that not every recreational athlete needs these high doses. Athletes who train 3-4 times a week without specific recovery problems can also function perfectly well on lower dosages such as 500 to 1000 milligrams per day. The key is that your body recovers well, and the required omega-3 dosage depends on your training load and how your body responds to it.

An important point: always look at the amount of EPA and DHA on the label, not the total amount of ‘fish oil’ or ‘omega-3’. A 1000 milligram fish oil capsule might only contain 300 milligrams of actual EPA and DHA. The rest is other fats that your body benefits less from.

First, look at your diet

Before you reach for supplements, fatty fish is by far the best source. Salmon contains about 1800-2200 milligrams of EPA and DHA per 100 grams, mackerel about 2500 milligrams, herring and sardines 1500-2000 milligrams. A 150-gram portion of salmon already provides around 3000 milligrams, which is more than enough. Tuna varies between 500 and 1500 milligrams per 100 grams depending on the type.

If you eat oily fish two to three times a week, you're doing well. For many amateur athletes, that's already enough without supplements. Both fresh and tinned fish (such as sardines or mackerel in water) are excellent sources.

For vegetarians and vegans, it is more difficult. Plant-based sources such as flaxseed (approximately 2300 milligrams of ALA per tablespoon), chia seeds (2500 milligrams of ALA per tablespoon), and walnuts (2500 milligrams of ALA per 30 grams) primarily contain ALA. Due to the inefficient conversion to EPA and DHA, with only 5 to 10 percent absorbed, supplementation with algae oil may be beneficial. Algae oil is a plant-based source that directly contains EPA and DHA, without the need to rely on fish.

If you're supplementing anyway: what do you pay attention to?

Quality is more important than the lowest price. Choose supplements in triglyceride form (TG form or rTG form) for better absorption. Pay attention to purity: quality marks such as IFOS or Friend of the Sea indicate that the product has been tested for heavy metals and PCBs. Store capsules in a cool, dark place.

Take omega-3 with meals and split high doses throughout the day (e.g., 1000 milligrams with breakfast and dinner). Be patient: it takes two to three months for your omega-3 status to be optimal. Do not exceed 3000 milligrams per day without medical advice.

Important: look at the amount of EPA and DHA on the label, not ‘fish oil’. A 1000-milligram fish oil capsule may only contain 300 milligrams of EPA and DHA.

The omega-6 balance

You may have heard about the omega-6 to omega-3 ratio. Omega-6 fatty acids are also essential, but are found mainly in vegetable oils, processed foods, and nuts. While omega-3 has anti-inflammatory effects, omega-6 fatty acids in large quantities can actually promote inflammation.

In the Western diet, we often consume a ratio of 15 to 20 parts omega-6 to 1 part omega-3. That's unbalanced. A ratio of around 4 or 5 to 1 is considered healthier. You don't need to avoid omega-6 entirely. You need them too, but awareness helps.

Practically, this means: limit fried foods and highly processed products, choose olive oil or rapeseed oil over sunflower oil or corn oil, eat oily fish regularly, and consider omega-3 supplementation if you consume little fish.

Who would benefit from omega-3 supplementation?

Omega-3 supplementation can be beneficial for athletes who eat little or no oily fish. If you have fish on your plate less than once a week, you are likely to be below the desired intake. For vegetarians and vegans who do not use algal oil, supplementation is almost essential to get enough EPA and DHA.

Higher dosages (1500-2000 milligrams) are particularly interesting if you regularly suffer from prolonged muscle soreness, experience slow recovery, or train very intensely (daily or multiple sessions per day). Endurance athletes looking to optimally support their cardiovascular health may also benefit.

For contact sports where brain protection is relevant, omega-3 is sometimes advised due to potential protective effects for concussions. It may also offer relief for joint pain due to its anti-inflammatory effect, although this is not a substitute for medical treatment.

If you train 3 to 4 times per week without specific recovery issues, a basic dosage of 500 to 1000 milligrams is often sufficient. If you also eat oily fish two to three times a week, you're probably doing just fine and supplementation is less urgent, although it certainly doesn't hurt.

Possible side effects

Omega-3 is generally safe. At doses above 3000 milligrams per day, your blood may become slightly thinner. If you are taking blood thinners, consult your GP. Choose coated capsules or store them in the freezer to prevent fishy burps. Always take with a meal for better absorption and fewer stomach complaints.

Do not expect direct effects within a few days. Your cell membranes will gradually replace omega-6 with omega-3, and this takes eight to twelve weeks. Some athletes notice less muscle soreness sooner, but full rebuilding requires patience.

The bottom line

Omega-3 fatty acids are essential fats that everyone needs. For athletes, they become more interesting because training puts your body under extra pressure. EPA and DHA aid in inflammation regulation, recovery, cardiovascular health, and potentially brain function.

It won't make you suddenly faster, but omega-3 can create the conditions in which your body functions better under training stress. This could mean less muscle soreness, quicker recovery, and in the long term, a healthier cardiovascular system. For many recreational athletes, that's valuable enough.

Whether you take supplements or not largely depends on your diet. If you eat oily fish two to three times a week, you're probably fine. For vegetarians, vegans, or people who eat little fish, supplementation with algae oil or fish oil can be beneficial. Then, choose quality: IFOS certification and triglyceride form.

Be patient. Give it a minimum of eight to twelve weeks before evaluating its effects. Omega-3 works gradually, by incorporating itself into your cell membranes. It is not a quick fix, but a long-term investment in how your body functions.

Omega-3 is not a must-have for every athlete, but it can be a meaningful addition. Especially if your dietary intake is insufficient. As with all nutritional choices: let yourself be guided by what works for your body and situation.

Would you like personal advice on omega-3 and how it fits into your overall diet as an athlete? Contact us for a bespoke sports nutrition consultation.