Updated June 2026 · Ireland Health Shop · In partnership with The Honey Pot, Clonmel
Omega-3 fatty acids are a family of polyunsaturated fats essential to human health. "Essential" in nutritional science means the body cannot synthesise them — they must come from diet. The three primary forms are:
Ireland's traditional diet — despite the Atlantic coastline — has not historically been rich in oily fish. The national Irish staple fish is cod (a white fish with minimal omega-3s), and while salmon, mackerel, herring, and sardines are readily available, consumption is low. The Irish National Adult Nutrition Survey (IUNA, 2011) found median EPA+DHA intakes well below the recommended 250–500mg per day for most adults, with women and younger adults showing the lowest intakes.
Several factors drive this:
This is the most extensively studied area of omega-3 research. EPA and DHA have multiple cardiovascular benefits:
Cardiovascular disease remains the leading cause of death in Ireland, accounting for around 36% of all deaths. The HSE's cardiovascular prevention guidelines include dietary omega-3 as a key recommendation. High-dose prescription omega-3 (icosapentaenoic acid, pure EPA) has been shown in the REDUCE-IT trial to significantly reduce cardiovascular events in high-risk patients.
DHA constitutes approximately 20% of the fatty acids in the brain's grey matter and is the dominant fat in neural cell membranes. It supports membrane fluidity, neurotransmitter receptor function, and neuroprotection. Low DHA status has been associated with:
The Omega-3 Index — a measure of EPA+DHA as a percentage of red blood cell fatty acids — is increasingly used as a cardiovascular and cognitive risk marker. An index below 4% is considered high risk; above 8% is considered optimal. Most Irish adults without supplementation are estimated to have an index in the 4–6% range.
EPA in particular reduces the production of pro-inflammatory prostaglandins and leukotrienes — the chemical mediators of inflammation in joints and other tissues. Multiple randomised controlled trials have demonstrated that omega-3 supplementation reduces morning stiffness, joint tenderness, and the need for NSAIDs in people with rheumatoid arthritis. Benefits in osteoarthritis are more modest but still meaningful for many people.
DHA is concentrated in the retina (it makes up about 50% of retinal fatty acids) and is essential for visual development in infants and visual function across life. Low DHA is associated with age-related macular degeneration — the leading cause of vision loss in older Irish adults.
DHA is critical for fetal brain and retinal development, particularly in the third trimester when the brain grows most rapidly. The HSE and FSAI recommend 200mg DHA daily during pregnancy and breastfeeding. Studies show improved cognitive outcomes in children whose mothers supplemented adequately with DHA.
A growing body of evidence links omega-3 — particularly EPA — with mental health outcomes. Meta-analyses have found significant antidepressant effects for omega-3 supplements, with formulations containing a higher EPA:DHA ratio appearing most effective for mood. Some psychiatrists now use high-dose EPA as an adjunct treatment for depression.
Not all fish oil supplements are equal. Here's what to look for:
A "1000mg fish oil" capsule might contain only 300mg of EPA+DHA — the remaining 700mg is other fats with no particular benefit. Look for the actual EPA and DHA content on the label. For general health maintenance, aim for 500–1000mg EPA+DHA daily. For therapeutic purposes (cardiovascular risk, high triglycerides, inflammatory conditions), 2000–4000mg EPA+DHA daily may be appropriate.
Fish oils come in two main molecular forms: natural triglyceride (TG) form and processed ethyl ester (EE) form. The TG form is closer to how omega-3s occur naturally in fish and is generally better absorbed. Many premium supplements (including those stocked at The Honey Pot) use the re-esterified triglyceride form. EE-form oils are not inferior when taken with fat, but TG form offers absorption advantages.
Fish oil oxidises when exposed to air, light, or heat — oxidised fish oil loses its benefits and may be actively harmful. Signs of rancid fish oil include a very strong "fishy" smell or taste, or burping that smells unpleasant. Good-quality oils contain antioxidants (typically vitamin E/tocopherols) to prevent oxidation, and are stored in opaque bottles. Refrigerate after opening.
Fish can accumulate heavy metals (mercury, lead, cadmium) and environmental contaminants (PCBs, dioxins). Reputable omega-3 supplements are molecularly distilled to remove contaminants. Look for products that publish IFOS (International Fish Oil Standards) certification or equivalent third-party testing. Krill oil, derived from tiny crustaceans at the base of the food chain, is naturally lower in contaminants and doesn't require distillation.
Krill oil contains EPA and DHA in phospholipid form, which some research suggests is better absorbed than fish oil triglycerides. Krill oil also contains astaxanthin, a powerful antioxidant. The downside is cost — krill oil is significantly more expensive per milligram of EPA+DHA. For most people, a high-quality fish oil provides excellent value. Krill oil is worth considering for people who experience digestive issues with fish oil or want astaxanthin's additional benefits.
For vegans and vegetarians, algae-derived DHA/EPA is the only direct source of these fatty acids that doesn't come from fish or krill. Algae oil is actually the original source — fish accumulate omega-3s by eating algae (directly or through the food chain). Algae oil provides EPA and DHA directly, bypassing the poor conversion from ALA entirely.
Algae-based omega-3 supplements have been shown in clinical studies to raise blood DHA levels as effectively as fish oil. They are increasingly available in Irish health stores, including The Honey Pot in Clonmel, and are certified sustainable (no fishing required).
ALA-rich foods (flaxseed, chia, hemp seed, walnuts) are valuable for general nutrition but should not be considered a substitute for marine omega-3s for heart, brain, or joint health purposes.
Fish oil is generally very safe. At higher doses (above 3g daily), it can have mild blood-thinning effects — this is relevant for people on anticoagulant medications (warfarin, dabigatran, rivaroxaban). If you're on blood thinners, consult your GP before taking high-dose fish oil. At standard doses, fish oil is safe alongside most medications and poses no significant bleeding risk for healthy individuals.