In an analysis of 36 randomized trials, including 22 double-blind in design, supplementation with omega 3 fish oil reduced systolic blood pressure by 2.1 mm Hg and diastolic blood pressure by 1.6 mm Hg. The blood pressure lowering effect was higher in participants who were > 45 years of age with high blood pressure. The median dose of fish oil was 3.7 g/day.
The researchers concluded:
“High intake of fish oil may lower BP, especially in older and hypertensive subjects.”