title: "Omega-3 for Men Over 40: Why You're Probably Deficient and How to Fix It" description: "Omega-3 supplementation for men over 40: why you're likely deficient, EPA vs DHA ratios, brain and heart benefits, dosing recommendations, and best sources." date: "2026-03-29" category: "Supplements" tags: ["omega-3", "fish oil", "brain-health", "heart-health", "anti-inflammatory", "supplementation"]
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The Omega-3 Gap
The average UK adult consumes approximately 0.2–0.3g of EPA and DHA per day from dietary sources. The research-backed target for meaningful health benefits in adults — particularly for cardiovascular protection and anti-inflammatory effects — starts at 1g per day and scales to 2–4g for specific therapeutic targets.
That's a gap of 3–13× between what most men eat and what the evidence supports. It's one of the most common and consequential nutritional deficiencies in the UK adult population, and it's almost entirely fixable with straightforward supplementation.
What EPA and DHA Are
Omega-3 fatty acids are a family of polyunsaturated fats. The three most relevant are:
ALA (Alpha-Linolenic Acid) — Found in flaxseed, chia seeds, walnuts, and hemp. The plant-based omega-3. Your body can convert ALA to EPA and DHA, but the conversion rate is poor — typically 5–15% to EPA and under 1% to DHA. ALA from plant sources is not a meaningful substitute for direct EPA and DHA intake.
EPA (Eicosapentaenoic Acid) — The primary anti-inflammatory omega-3. EPA directly inhibits the production of inflammatory eicosanoids (signalling molecules that drive chronic inflammation). Found in oily fish and fish oil supplements.
DHA (Docosahexaenoic Acid) — Structural omega-3. The brain is 40% DHA. Found in high concentrations in the retina, heart muscle, and cell membranes throughout the body. Critical for cognitive function, cardiovascular health, and cell membrane integrity. Also found in oily fish and fish oil.
When omega-3 benefits are discussed in research, it's almost always EPA and DHA — not ALA.
Why It Matters More After 40
Cardiovascular Protection
The cardiovascular evidence for EPA and DHA is among the strongest in nutrition research. Multiple large meta-analyses show:
- Reduced triglycerides (a key cardiovascular risk marker) by 15–30% at 2–4g EPA+DHA per day
- Reduced atrial fibrillation risk
- Reduced cardiovascular events in high-risk populations
- Reduced arterial stiffness
After 40, cardiovascular risk begins its meaningful upward trajectory. The window for preventive intervention is now.
The REDUCE-IT trial (2018) used a high-dose EPA-only formulation (Vascepa, 4g EPA per day) and showed a 25% reduction in major cardiovascular events in a high-risk population. This was remarkable enough to change prescribing practice in several countries.
Anti-Inflammatory Effects
Chronic low-grade inflammation is increasingly recognised as a central mechanism in cardiovascular disease, insulin resistance, cognitive decline, and the hormonal changes of ageing. EPA specifically reduces the production of pro-inflammatory prostaglandins and leukotrienes.
For men over 40, managing chronic inflammation is a practical strategy for slowing the metabolic deterioration that drives most age-related conditions. Omega-3s are one of the most effective dietary tools for this.
Testosterone and Hormonal Health
EPA and DHA have moderate evidence for supporting testosterone production. The mechanism: omega-3s are incorporated into Leydig cell membranes, and membrane fluidity affects LH receptor signalling (LH triggers testosterone production). Additionally, anti-inflammatory effects may reduce the inflammatory suppression of testosterone that occurs in states of chronic inflammation.
A 2021 study in controlled populations showed men supplementing omega-3 had higher testosterone levels than controls, with the effect being larger in men with high inflammatory markers at baseline.
Joint Health
DHA and EPA reduce the production of inflammatory cytokines in joint tissue. At therapeutic doses (2–3g EPA+DHA per day), omega-3s have evidence for reducing joint stiffness, improving morning mobility, and allowing reduction of NSAID use in inflammatory joint conditions.
For men over 40 who train — where joint health becomes a training longevity issue — this is a practical benefit.
Cognitive Function and Brain Health
DHA is a structural component of brain cell membranes and is essential for optimal cognitive function. DHA depletion with age is associated with accelerating cognitive decline. Supplementation at 1–2g DHA per day shows benefit for memory and processing speed in some trials, particularly in men with low baseline omega-3 status.
Dietary Sources
Oily fish is the primary dietary source of EPA and DHA:
| Fish | EPA+DHA per 100g | |------|-----------------| | Mackerel | 2.5g | | Salmon (farmed) | 2.2g | | Sardines (tinned in oil) | 1.5g | | Herring | 1.7g | | Tuna (fresh) | 0.9g | | Tuna (tinned in water) | 0.3g | | Cod | 0.2g |
To hit 2g EPA+DHA per day from food alone, you'd need approximately 2–3 portions of oily fish daily. This isn't practical for most men, which is why supplementation is relevant.
The NHS recommendation of two portions of fish per week (one oily) provides approximately 0.4–0.6g EPA+DHA per week — a fraction of therapeutic targets.
Supplementation: What to Buy
The Dosing Confusion
Fish oil supplements are sold by total oil weight, not EPA+DHA content. A "1000mg fish oil capsule" may contain only 300mg of EPA+DHA. You need to read the label for actual EPA and DHA content — this is the number that matters.
Standard fish oil (1000mg capsule, ~30% EPA+DHA): 300mg EPA+DHA per capsule. To hit 2g EPA+DHA, you'd need 7 capsules. This is impractical.
High-concentration fish oil (1000mg capsule, ~70–80% EPA+DHA): 700–800mg EPA+DHA per capsule. Two to three capsules hits 1.5–2g. Much more practical.
Target: 2–3g EPA+DHA per day for cardiovascular and anti-inflammatory benefit. 1g minimum for general health maintenance.
UK Products Worth Buying
Bare Biology Lion Heart — A UK brand, high EPA+DHA concentration (1000mg EPA+DHA per capsule), sustainably sourced, third-party tested. One of the best UK-available products. Around £30–35 per month at 2 capsules daily.
Nordic Naturals Ultimate Omega — The gold standard for quality and purity testing. High concentration, molecularly distilled. Available on Amazon UK. Around £30–40 per month.
Wiley's Finest Wild Alaskan Fish Oil Peak EPA — High EPA specifically, good for men prioritising anti-inflammatory effects. Available on Amazon UK.
What to avoid: Generic supermarket fish oil capsules at the minimum EPA+DHA concentration. The cost saving is negated by needing 6+ capsules to hit a meaningful dose. Better to buy fewer, higher-concentration capsules.
Liquid Fish Oil
For men who find multiple capsules impractical, liquid fish oil (Nordic Naturals, Carlson) provides high EPA+DHA per teaspoon. Palatable in a smoothie or straight. Often more economical per gram of EPA+DHA than capsules.
Algae-Based Omega-3
For men who are vegan or vegetarian, or who prefer to avoid fish entirely, algae oil provides DHA directly (the original source — fish accumulate DHA by eating algae). Some algae oils now also contain EPA. Less economical than fish oil but a functional alternative.
Timing and Practical Notes
Take with fat. Omega-3 absorption increases significantly when taken with a fat-containing meal. Don't take on an empty stomach.
Avoid heat and light. Omega-3 fatty acids oxidise and become rancid when exposed to heat, light, or air. Store in a cool, dark place. Capsules are more protected than liquids; refrigerate liquids after opening.
Check for freshness. Rancid fish oil has a strong, unpleasant smell. Fresh fish oil smells mild. If your supplement smells strongly of old fish, it's oxidised — not just unpleasant, potentially counterproductive.
Blood thinning: At doses above 3g EPA+DHA per day, omega-3s have mild blood-thinning effects. This is not a concern for most men but is relevant for anyone on anticoagulant medication (warfarin, heparin, aspirin). Discuss with a doctor before high-dose supplementation if you're on blood thinners.
Measuring Your Omega-3 Status
The Omega-3 Index is a validated test measuring the percentage of EPA+DHA in red blood cell membranes. It reflects long-term omega-3 intake in the same way HbA1c reflects long-term blood glucose.
Target Omega-3 Index: 8–12%. Below 4% is high cardiovascular risk. Most UK adults are at 4–6%.
Medichecks offers an Omega-3 Index test (around £49). Worth doing once to establish your baseline and again after 3 months of supplementation to confirm target levels are achieved.
The Short Version
EPA and DHA omega-3s are essential for cardiovascular health, inflammation management, joint health, cognitive function, and hormonal support in men over 40. Most UK men are meaningfully deficient. Target 2–3g EPA+DHA per day — from oily fish 3+ times per week, supplemented with a high-concentration fish oil. Buy on EPA+DHA content, not total oil weight. Take with food. Bare Biology and Nordic Naturals are the UK recommendations.