Research appearing in The Lancet (DOI:10.1016/S0140-6736(08)61239-8, published online Aug 31, 2008 ahead of print) shows that fish oil is beneficial to patients with congestive heart failure. The double-blind, placebo-controlled study took place in over 300 cardiology centers in Italy, and involved over 7,000 patients diagnosed with heart failure. Half of the subjects took a daily fish oil capsule and half took a placebo.