BOSTON, MASSACHUSETTS. Numerous studies have concluded that consumption of fish oil supplements lowers blood pressure, but a few have found no effect and others have been inconclusive. Researchers at the Harvard Medical School have completed a major evaluation of the results of 31 placebo-controlled trials involving 1356 subjects.
CINCINNATI, OHIO. Conventional blood pressure lowering medications often have detrimental effects on quality of life and may lead to unfavourable changes in cholesterol levels. Several studies have found that supplementation with large amounts of fish oil (5-15 grams/day) lowers blood pressure significantly in hypertensive individuals. Whether smaller amounts are equally effective has been open to question.
OSLO, NORWAY. Most heart transplant patients (60-100%) develop hypertension within six months following their surgery. It is believed that the increase in blood pressure is caused by the anti-rejection drug cyclosporine. Medical doctors at the University of Oslo now report that supplementation with fish oils will prevent the development of hypertension. Their clinical trial involved 28 heart transplant patients who, 4 days after surgery, were randomized to receive either 4 grams of fish oil (providing 1.9 g of eicosapentaenoic acid [EPA] and 1.5 g of docosahexaenoic acid [DHA] as well as 14.8 mg of vitamin E) or 4 grams of corn oil with vitamin E once a day for 6 months. The patients' blood pressure (24-hour readings) were measured 12 days, 1 month, 2 months, 3 months, and 6 months after surgery. Blood samples were also taken for analysis of EPA and DHA content.