SPECIALTY TOPICS · GUIDE
Omega-3 Fatty Acids and Healthy Aging Evidence
What large trials and reviews show for omega-3 supplements in older adults: heart outcomes, cognition, telomeres and biological-age clocks, with the DO-HEALTH and VITAL results and risks.
Content last updated . This page has not been medically reviewed.
Back to Longevity & Healthy AgingQuick answer
Omega-3 fatty acids (including EPA and DHA, found in oily fish) are well studied. [1] For the aging question, the best randomized evidence shows little or no effect on death from any cause, and small, mixed effects on heart outcomes. A 2025 analysis of one trial found a small slowing of some DNA methylation "biological age" clocks, but a biomarker change is not a health outcome. This page covers the longevity angle only; dedicated nutrient guidance lives in the supplements section: omega-3 evidence by use and omega-3 safety and interactions. Labels used: mixed, insufficient evidence, no good evidence of benefit (for lifespan), evidence of harm (atrial fibrillation signal).
Mortality and heart disease
- Cochrane review (2020). 86 trials, 162,796 participants, lasting 12 to 88 months. Increasing long-chain omega-3 had little or no effect on all-cause mortality (risk ratio 0.97, 95% CI 0.93 to 1.01; high-certainty evidence) or on cardiovascular events (0.96, 0.92 to 1.01). Cardiovascular mortality was slightly lower (0.92, 0.86 to 0.99; moderate certainty) and may slightly reduce coronary heart disease events (low certainty). [1]
- VITAL trial (2019). 25,871 adults (men 50+, women 55+) took 1 g a day of marine omega-3 or placebo for a median of 5.3 years. Major cardiovascular events (hazard ratio 0.92, 0.80 to 1.06) and cancer (1.03, 0.93 to 1.13) were not significantly different. Heart attacks were lower (0.72, 0.59 to 0.90), a secondary finding. Death from any cause: 1.02 (0.90 to 1.15). No excess bleeding or serious adverse events were observed. [2]
- Another meta-analysis (2021). 38 trials, 149,051 participants, found lower cardiovascular mortality overall, stronger with EPA-only drugs than EPA+DHA, but a higher risk of atrial fibrillation (rate ratio 1.26, 1.08 to 1.48), and more bleeding with EPA alone. [3]
Why results differ: trials used different products, amounts (the Cochrane trials ranged from 0.5 g to more than 5 g a day) and groups of people. [1]
Brain and thinking
A 2020 meta-analysis of 25 trials in people without dementia found no effect on global cognitive function and a small benefit on memory. [4] A 2024 meta-analysis of 12 studies (1,124 people) with mild cognitive impairment found a benefit for global cognition, but the authors said only two relevant articles supported part of the finding and more research is needed. [5] Evidence: mixed. See cognitive health and brain aging.Telomeres and biological-age clocks (biomarkers)
- Telomeres. In a 4-year VITAL sub-study of 1,054 participants, marine omega-3 had no significant effect on telomere shortening; the vitamin D arm did show a small reduction. [6] See telomeres and aging.
- Epigenetic clocks. In a post hoc analysis of 777 people in the DO-HEALTH trial, 1 g a day of omega-3 slowed three of four DNA methylation clocks over 3 years by about 2.9 to 3.8 months in standardized terms. The authors called it a small protective effect. [7] Because the analysis was post hoc, it is hypothesis-generating. One author founded a nonprofit that licenses epigenetic clock patents and works for Altos Labs. [7] This analysis did not test whether a change in the clocks means better health. See epigenetic clocks and DNA methylation.
Food, supplements and lifestyle
The Cochrane review found little evidence of effects of eating fish. [1] For diet patterns, see dietary patterns and healthy aging and supplements vs lifestyle for longevity.Frequently asked questions
Do omega-3 supplements help you live longer?
A Cochrane review of 86 trials found little or no effect on all-cause mortality. [1]
Did omega-3 slow biological aging in a trial?
In one post hoc DO-HEALTH analysis, small slowing of some DNA methylation clocks appeared. The authors call it a small effect. It is a biomarker result. [7]
Do they protect telomeres?
Not in the VITAL telomere sub-study; marine omega-3 had no significant effect over 4 years. [6]
Are there risks?
A 2021 meta-analysis found more atrial fibrillation with omega-3, and more bleeding with EPA alone. [3]
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
Safety and who should check first
The meta-analyses above found a higher risk of atrial fibrillation with omega-3 and more bleeding with EPA alone. [3] People with heart rhythm problems, on blood thinners, or with fish or shellfish allergy, and anyone preparing for surgery, should ask a clinician: medication interactions. Prescription omega-3 products are medicines, not the same as supplements: prescription omega-3 vs supplements.
References
- Omega-3 fatty acids for the primary and secondary prevention of cardiovascular disease. The Cochrane database of systematic reviews, 2020. PubMed abstract. Read 2026-10-22.
- Marine n-3 Fatty Acids and Prevention of Cardiovascular Disease and Cancer. The New England journal of medicine, 2019. PubMed abstract. Read 2026-10-22.
- Effect of omega-3 fatty acids on cardiovascular outcomes: A systematic review and meta-analysis. EClinicalMedicine, 2021. PubMed abstract. Read 2026-10-22.
- Long-chain omega-3 polyunsaturated fatty acids and cognitive decline in non-demented adults: a systematic review and meta-analysis. Nutrition reviews, 2020. PubMed abstract. Read 2026-10-22.
- N-3 Polyunsaturated Fatty Acids in Elderly with Mild Cognitive Impairment: A Systemic Review and Meta-Analysis. Journal of Alzheimer's disease : JAD, 2024. PubMed abstract. Read 2026-10-22.
- Vitamin D3 and marine ω-3 fatty acids supplementation and leukocyte telomere length: 4-year findings from the VITamin D and OmegA-3 TriaL (VITAL) randomized controlled trial. The American journal of clinical nutrition, 2025. PubMed abstract. Read 2026-10-22.
- Individual and additive effects of vitamin D, omega-3 and exercise on DNA methylation clocks of biological aging in older adults from the DO-HEALTH trial. Nature aging, 2025. PubMed abstract. Read 2026-10-22.
Education, not medical advice. This page is for general information. It does not diagnose or treat any condition and is not a substitute for care from a qualified health professional. Natural does not automatically mean safe. Ask a clinician or pharmacist before changing your care, especially if you take medication, are pregnant or breastfeeding, or have a health condition.