What are omega-3 fatty acids doing for my heart — and do I need to take them?

Omega-3 fatty acids (EPA and DHA) at doses of 2–4 g/day reduce triglycerides by 20–50%, modestly reduce blood pressure, and in statin-treated patients with elevated triglycerides, the REDUCE-IT trial (Bhatt et al., NEJM, 2019) demonstrated a 25% relative risk reduction in major adverse cardiovascular events with icosapentaenoic acid (EPA) at 4 g/day, making high-dose omega-3 therapy a legitimate cardiovascular intervention in specific populations (Bhatt et al., NEJM, 2019).

The nuance: the REDUCE-IT trial used icosapentaenoic acid only (Vascepa), not a standard fish oil combination, and the mineral oil placebo used in the trial may have inflated the apparent benefit by worsening the control group. Subsequent trials using EPA+DHA combinations (STRENGTH trial with corn oil placebo) did not show the same benefit. Standard fish oil at 1–2 g/day has anti-inflammatory effects and modest cardiovascular benefit in general populations (VITAL trial) but does not meet the SELECT/REDUCE-IT level of evidence for major cardiovascular events. For men with elevated triglycerides (above 150 mg/dL) and established cardiovascular disease or high risk, high-dose omega-3 prescription therapy (Vascepa, Lovaza) is worth discussing with a cardiologist.

Honesty Scale: High-dose EPA for CV event reduction in at-risk populations, Solid (1) based on REDUCE-IT. Standard fish oil (1–2 g/day) for general CV prevention, Promising (2). Anti-inflammatory effects of EPA+DHA, Solid (1).

What to do: For most men over 40: 1–2 g/day EPA+DHA from fish oil (Nordic Naturals, Carlson, or similar third-party tested brands) is a reasonable anti-inflammatory foundation. If your triglycerides are above 200 mg/dL, discuss high-dose prescription omega-3 therapy with your cardiologist.

For the full picture, read The Supplementation Deep Dive