Natures Aid Super Strength Omega 3 Capsules 60s A krill is a small, shrimp-like creature that can be found in waters all across the globe. Krill used for commercial purposes are mostly caught in the Southern Ocean and around Japan; although worldwide there are more than 15 different species. Despite their small size, krill contain nutrients that may do wonders for your heart, hence their popular use in the pharmaceutical industry. Krill oil contains fatty acids similar to fish oil and helps heart function by decreasing swelling of the blood vessels, lowering blood pressure. Krill oil also helps to decrease friction and stickiness of platelets in blood cells, helping to decrease the risk of clots and heart disease from forming.