Krill oil is an oil from a very small shrimp-like animal. Krill is often eaten by whales, mackerel, and whale sharks. In many places in the world, such as Norway, this oil is extracted from krill, placed in capsules, and used for medicine. This is because krill oil has been known to decrease heart disease, reduce high levels of blood fats such as triglycerides, reduce high cholesterol, decrease high blood pressure, and fight off stroke and osteoarthritis.
Some people have also used krill oil to fight depression and anxiety, premenstrual syndrome, and painful menstrual periods. Krill oil contains fatty acids that are similar to those in fish oil. These fatty acids are beneficial fats that can decrease swelling throughout the body. They also have the ability to make blood platelets less sticky, decreasing the chances of the formation of blood clots, heart attack, stroke, and embolism.