Let me ask you something straightforward. When was the last time you ate oily fish? Not the processed fish finger kind — a proper portion of salmon, mackerel, sardines, or anchovies. If the answer is "I can't remember" or "once a month, maybe," you are in the same boat as most adults over fifty in the UK. And that matters, because omega-3 fatty acids are not optional extras. They are structural components of your brain, anti-inflammatory agents for your joints, and protective players for your heart. After fifty, your body's need for them does not decrease. It increases. Let me walk you through why, and what to do about it.
What omega-3 actually does in the body
Omega-3 fatty acids are a family of essential fats, meaning your body cannot make them efficiently from scratch — you have to get them from food or supplements. There are three forms that matter: EPA (eicosapentaenoic acid), DHA (docosahexaenoic acid), and ALA (alpha-linolenic acid). EPA and DHA are found in oily fish and marine sources. ALA is found in plant foods like flaxseed, walnuts, and rapeseed oil.
Here is the critical point: your body can convert ALA into EPA and DHA, but the conversion is remarkably inefficient — often less than 5–10% for EPA and even lower for DHA. That means eating a handful of walnuts is good for your overall fat intake, but it does not reliably deliver the EPA and DHA your brain and joints are asking for.
EPA and DHA are incorporated into cell membranes throughout your body. DHA is particularly concentrated in the brain and the retina of the eye. It makes up around 40% of the polyunsaturated fatty acids in the cerebral cortex. EPA, meanwhile, plays a leading role in the production of anti-inflammatory molecules called resolvins and protectins. These are the compounds that help your body wind down inflammation after it has done its job. Without enough EPA, that wind-down process is sluggish, and chronic low-grade inflammation — the kind associated with stiff joints, cardiovascular risk, and cognitive decline — has more room to operate.
Why omega-3 matters more after 50
There are several reasons this conversation gets more urgent as you cross the half-century mark.
The brain. Brain volume naturally shrinks with age, and the rate of that shrinkage matters for cognitive function. The brain is roughly 60% fat, and DHA is the predominant omega-3 in neural tissue. Several observational studies have linked higher DHA intake with slower rates of cognitive decline in older adults. A 2022 systematic review in Nutrients found that omega-3 supplementation was associated with improved cognitive outcomes in adults over 50, particularly those with mild cognitive complaints. This is not about reversing dementia. It is about giving your brain the raw materials it needs to maintain function. Think of it as maintenance, not repair.
The heart. The European Food Safety Authority (EFSA) has approved a health claim that EPA and DHA contribute to the normal function of the heart at a dose of 250mg per day. For over-50s managing blood pressure, cholesterol, or general cardiovascular risk, omega-3s are one of the few dietary interventions with robust evidence behind them. The British Heart Foundation acknowledges that oily fish consumption is associated with lower rates of heart disease, and while the picture around supplements is more nuanced, ensuring adequate EPA and DHA intake is sensible regardless.
The joints. If you have noticed your knees are less forgiving than they used to be, or your fingers feel stiffer in the morning, you are not imagining it. Ageing joints produce more inflammatory markers, and the synovial fluid that lubricates them becomes less generous. Omega-3 fatty acids, particularly EPA, have been shown in clinical trials to reduce joint stiffness and tenderness. A meta-analysis published in the Annals of the Rheumatic Diseases found that fish oil supplementation reduced self-reported joint pain in participants with rheumatoid arthritis, with the best results at doses above 3g of combined EPA and DHA. Even if you do not have a diagnosed condition, the anti-inflammatory effect of adequate omega-3 intake supports joint comfort during and after exercise — something that matters a great deal when you are trying to start strength training or stay active.
Inflammation generally. Chronic low-grade inflammation, sometimes called "inflammaging," is a background driver of many age-related health issues: cardiovascular disease, metabolic syndrome, cognitive decline, and muscle loss. Omega-3s are one of the most well-studied dietary modulators of this process. They do not replace medication or a good diet, but they contribute meaningfully to the anti-inflammatory environment your body needs.
EPA, DHA, and ALA: know the difference
This trips people up, so let me keep it simple.
EPA is your anti-inflammatory workhorse. It is the form most studied for mood, inflammation, and heart health. If your primary concern is joint pain or cardiovascular risk, you want a supplement with a meaningful amount of EPA.
DHA is the brain builder. It is the structural omega-3, present in cell membranes, critical for neural signalling, and particularly important for cognitive function and eye health. If your priority is mental sharpness and long-term brain health, DHA is where your attention should go.
ALA is the plant-based omega-3. It is found in flaxseed, chia seeds, hemp seeds, and walnuts. It is good to include in your diet, but do not rely on it to deliver the benefits of EPA and DHA. The conversion rate is too low, and it declines further with age.
The ideal supplement provides a combination of EPA and DHA in a ratio that covers both anti-inflammatory and structural needs. A product delivering 500mg+ of EPA and 250mg+ of DHA per serving is a sensible baseline for most over-50s.
How much do you actually need?
There is no single magic number, but the evidence converges on a clear range.
The Scientific Advisory Committee on Nutrition (SACN) in the UK recommends that adults consume at least one portion (around 140g when cooked) of oily fish per week. That delivers roughly 450mg of combined EPA and DHA — useful, but often not enough for someone dealing with joint stiffness, elevated inflammation, or cognitive concerns.
The EFSA considers up to 5g per day of combined EPA and DHA to be safe for long-term use. Most clinical trials showing benefits for joints, brain, and heart used doses in the range of 1–3g per day.
My practical recommendation: aim for 1–2g of combined EPA and DHA daily. If you eat oily fish two to three times a week, you may be getting enough from food. If you do not — and most people over 50 in the UK do not — a supplement fills the gap. Start with 1g and, if joint or cognitive symptoms are significant, consider increasing to 2g. Always check with your GP if you are on blood-thinning medication, as high-dose omega-3 can interact with anticoagulants.
Food sources vs supplements
The best source of omega-3 is real food, specifically oily fish. Here is what you are looking at:
- Salmon (wild or farmed): roughly 2g of combined EPA and DHA per 140g serving
- Mackerel: around 2.5g per 140g serving — one of the richest sources
- Sardines: approximately 1.5g per 140g serving, plus calcium from the bones
- Anchovies: about 1.5g per 140g serving, often more affordable
- Trout: roughly 1g per 140g serving
If you ate a portion of oily fish three times a week, you would cover the lower end of the recommended range from food alone. The UK population average falls well short of that. The National Diet and Nutrition Survey consistently shows that oily fish intake in British adults is below recommended levels.
Plant sources like flaxseed, chia seeds, and walnuts provide ALA, which supports overall fat balance but does not reliably raise EPA or DHA levels. If you are vegetarian or vegan, an algae-based omega-3 supplement provides DHA directly from the original marine source without the fish — a legitimate alternative.
The reality is that supplements are not a replacement for a good diet. They are a practical tool for people who do not consistently eat the foods that deliver the nutrients they need. After fifty, when the margin for nutritional error gets narrower, that practicality matters.
Quality matters: what to look for in a supplement
Not all omega-3 supplements are created equal. Here is what separates a good product from a waste of money.
IFOS certification. The International Fish Oil Standards (IFOS) programme tests supplements for purity, potency, and oxidation. Look for a product that carries IFOS five-star certification. This means it has been independently tested and passed for heavy metals (mercury, lead, cadmium), PCBs, dioxins, and oxidation markers. It is the closest thing the omega-3 world has to an independent quality seal.
Triglyceride form. Omega-3s exist in two main forms in supplements: ethyl ester (EE) and re-esterified triglyceride (rTG). The triglyceride form is the natural form found in fish, and research suggests it is absorbed more efficiently — some studies show 30–50% better absorption compared to ethyl ester. It costs more, but you get more of what you are paying for. If the label does not specify, contact the manufacturer. If they cannot tell you, that tells you something too.
The actual EPA and DHA content. The front of the bottle may say "1000mg fish oil," but that is the total oil content, not the omega-3 content. Turn the bottle over and read the supplement facts. A 1000mg fish oil capsule might contain only 300mg of combined EPA and DHA. Check the numbers. A good product will clearly list how much EPA and DHA you get per serving.
Freshness. Omega-3 oils oxidise over time, and oxidised fish oil loses potency and can produce unpleasant side effects like fishy burps. Check the manufacture date, not just the expiry date. A product that has sat on a shelf for two years is not what you want. Smell it when you open it — a strong, unpleasant fishy odour suggests oxidation.
Introducing Prime Omega-3 Krill
This is why we built Prime Omega-3 Krill. It delivers a concentrated dose of EPA and DHA in natural triglyceride form, sourced from Antarctic krill, with IFOS five-star certification. Krill oil carries its omega-3s in phospholipids — the same form found in your cell membranes — which means your body recognises and uses them efficiently. It is formulated for adults over fifty who need reliable, tested omega-3 without the guesswork.
If you are currently taking a generic fish oil from the supermarket, I would encourage you to check the label against the quality markers above. You may be surprised how little EPA and DHA you are actually getting, and whether the product has been tested for the things that matter.
Putting it together
Here is the practical version:
- Eat oily fish two to three times per week if you can. Sardines and mackerel are affordable and effective.
- If you do not eat enough oily fish, supplement with 1–2g of combined EPA and DHA daily.
- Choose a product with clear EPA and DHA dosing, triglyceride form, and IFOS or equivalent third-party certification.
- Take it with a meal that contains fat — omega-3s are fat-soluble and absorb better alongside dietary fat.
- If you are on blood thinners or have a bleeding disorder, check with your GP before starting.
Omega-3 is not a miracle pill. It is a foundational nutrient that your brain, heart, and joints need in greater quantities as you age. Cover the base, and everything else you do — the training, the sleep, the nutrition — works a little better. If you want a structured programme that integrates supplementation with strength, mobility, and recovery, the PRIME Programme covers all of it. Or for personalised guidance, PRIME Coach adapts to your specific needs.
Small things done consistently beat dramatic interventions done occasionally. Omega-3 is a small thing. Make it part of the routine.